Mancomunidad 2

Two load vectors are at 90 degrees to each other, having magnitudes of 3N and 4N respectively. What is the resultant load vector?. 5 N. x.

If a pilot applies a couple of 15 Nm to turn a control wheel which is 0.3 m wide, what is the magnitude of just one of the hand forces applied by the pilot?. 50 N. x.

What is the increase on the pressure at the bottom of a reservoir, if 90 litres of liquid is added to an existing quantity of 30 litres of the same liquid that exerts a pressure of 15 kPa at the bottom of the same reservoir?. 45 kPa. x.

How many pounds (Ib) is 80 kg?. 176,37 lbs. x.

How many kg is 20 lb?. 9,07 kg. x.

How heavy is 1000 kg in tonne (t)?. 1 tonne (t). x.

A weightless beam has two masses on it. One is 3 kg positioned 40 cm from the left end, another is 5 kg positioned 60 cm from the left end. What is the position of the centre of mass of the beam (measured from the left end)?. 52,5 cm. x.

A load of 400 N is suspended by a cable. If the maximum allowable stress in the cable is 20 N/mm2, what must be the minimum cross-sectional area of the cable?. 20 mm². x.

An aircraft component has a horizontal force of 40 Newtons applied to it. It also has a vertical force of 60 Newtons applied to it. What is the total amount of force that it must sustain?. 72,11 N. x.

What is the frequency of a pendulum the swings 1 cycle every 50 milliseconds?. 20 Hz. x.

The landing speed of an aircraft is 160 m/s. If the maximum deceleration is 40 m/s2, what is the minimum length of runway?. 320 meters. x.

An aircraft starts form rest on the runway and accelerates at 40 m/s2. What is its velocity after 5 seconds?. 200 m/s. x.

If a vibrating body has a fundamental resonant frequency of 5 Hz, what are the harmonic frequencies of that vibrating body?. 5, 10, 15, 20 Hz…. x.

A container with a mass of 10 kg is lifted to a height of 5 m and then returned back to the ground level. How much work is done by the gravitational force?. 0 J. x.

A cyclist starts form 50 m/s and accelerates to 80 m/s in 3 seconds. What is the cyclist’s acceleration?. 10 m/s². x.

What is the stopping distance if one car is traveling at 50 km/h and the other car is traveling at 80 km/h?. 50 km/h → 20 to 53,75 meters. 80 km/h → 51,2 to 100 meters. x.

A runner sprints round a circular track, for a distance of 100 m. The radius of the track is 100 m. What arc distance (in degrees) of the track has the runner completed?. 57,3º. x.

What is the acceleration of a mass of 500 kg, when a horizontal force of 80 N acts upon it? (assume no frictional forces). 0,16 m/s². x.

A cyclist starts from fest and reaches 6 m/s in 3 seconds. What is the cyclist’s acceleration?. 2 m/s². x.

A force of 10 N is required to move a mass of 200 kg with a constant velocity. What is the value of the friction coefficient of the opposing force? (Take ‘g’ as 10m/s2). 0,005. x.

A force of 10 N acting on an object causes it to move 10 meters in 4 seconds. What is the energy expended?. 100 Joules. x.

What is the kinetic energy of an aircraft with a mass of 3 tonnes that flies with a velocity of 300 m/s?. 135.000.000 J (135 MJ). x.

A force of 5 N acting on an object causes it to move 30 meters un 6 seconds. What is the power generated?. 25 watts. x.

A net force ‘F’ accelerates a mass ‘m’ with an acceleration ‘a’. If the same net force is applied to mass ‘3m’, what is its acceleration?. The new acceleration when the mass is 3m3m3m is one-third of the original acceleration. x.

Each second a propeller accelerates an air mass of 50 kg from rest to a velocity of 30 m/s. How much thrust is provided?. 1.500 N. x.

What is the work done in lifting a mass of 1600 kg vertically through a height of 50 m? (Take ‘g’ = 10 m/s2). 800.000 joules (800 kJ). x.

A force of 7N is applied to an object for 3 second. What is the impulse?. 21 Ns. x.

Two football player, one 70 kg, the other 80 kg, are running at 3 m/s. If they are both heading in the same direction, what is their total momentum?. 450 kg m/s. x.

A 12 g arrow is fired with a velocity of 80 m/s from a bow with a mass of 2 kg. What is the impulse of the arrow?. 0,96 kg m/s. x.

An aeroplane of mass 4,000 kg flies with a momentum of 800,000 kgm/s. What is its velocity?. 200 m/s. x.

What is the specific gravity of 20 kg of water occupying a volume of 8 m3 with respect to a substance having a density of 100 g/m3?. 25. x.

If the dynamic pressure in a fluid flow is 5 bar and the static pressure is 3 bar, what is the total pressure?. 8 bar. x.

If the total pressure in a fluid flow is 6 bar and the static pressure is 2 bar, what is its dynamic pressure?. 4 bar. x.

The temperature conversion formula from Celsius to Kelvin is: K = C + 273.15. x.

The temperature conversion formula from Kelvin to Celcius is: C = K − 273.15. x.

The temperature conversion formula from Fahrenheit to Celsius is: C = (F − 32) × 5⁄9. x.

The Temperature Conversion Formula from Celsius to Fahrenheit is: F = C(9⁄5) + 32. x.

The Temperature Conversion Formula from Fahrenheit to Kelvin is: K = (F − 32) × 5⁄9 + 273.15. x.

The Temperature Conversion Formula from Kelvin to Fahrenheit is: F = (K – 273.15) × 9⁄5 + 32. x.

A volume of 4m3 of gas at a pressure of 80 kPa and a temperature of 320 K is compressed by a piston inside a cylinder, to a volume of 1 m3 and a temperature of 600 K. How much does the pressure increase?. 520 kPa. x.

A steel rail of length 80 ft. is laid down when the temperature is 30°F. How much does this rail increase in length, when the temperature is 60°F? (Use coefficient of thermal expansion of 10 x 10-6 / °F). 0,025 ft or 0,288 inch. x.

A volume of 3m3 of gas at a pressure of 60 kPa and an temperature of 180 K is compressed by a piston inside a cylinder, to a volume of 1m3 and a pressure of 360 kPa. How much does the temperature of the gas increase?. 180 K. x.

What determines the atomic MASS number of an atom?. The atomic MASS number of an atom is the number of protons, only. The atomic MASS number of an atom is the number of both protons and neutrons. The atomic MASS number of an atom is the number of electrons, only.

According to Neils Bohr's mathematical formulations, how many electrons can the third orbit hold?. The third orbit of an atom holds 2 electrons. The third orbit of an atom holds 8 electrons. The third orbit of an atom holds 18 electrons.

Which compound has the chemical formula H2O?. Hydrogen peroxide has the chemical formula H2O. Carbon dioxide has the chemical formula H2O. Water has the chemical formula H2O.

What is true about isotopes?. Isotopes have different numbers of protons and electrons. All isotopes have identical physical properties. Isotopes can have different masses but the same atomic number.

What is the main criteria used to order the elements in the periodic table?. Elements in the periodic table are ordered according to their Atomic number. Elements in the periodic table are ordered according to their Electron configurations. Elements in the periodic table are ordered according to their Number of neutrons.

What condition is needed to turn a solid into a liquid?. The temperature of the solid must be increased, to turn a solid into a liquid. The heat energy must be extracted from the solid, to turn a solid into a liquid. The heat energy must be applied to the solid, to turn a solid into a liquid.

When a structural member is under tensile or compressive stress, what does the ratio of transverse strain to axial strain represent?. Ductility is the ratio of transverse strain to axial strain. Bulk Modulus is the ratio of transverse strain to axial strain. Poisson's ratio is the ratio of transverse strain to axial strain.

A load of 500 N is suspended by a cable. If the maximum allowable stress in the cable is 10 N/mm2, what must be the minimum cross sectional area of the cable?. Minimum cross sectional area of the cable = 0.02 mm2. Minimum cross sectional area of the cable = 50 mm2. Minimum cross sectional area of the cable = 5,000 mm2.

What is the increase in the pressure at the bottom of a reservoir, if 120 litres of liquid is added to an existing quantity of 20 litres of the same liquid that exerts a pressure of 10 kPa at the bottom of the same reservoir?. 50 kPa increase in pressure. 60 kPa increase in pressure. 40 kPa increase in pressure.

A weightless beam has two masses on it. One is 2 kg positioned 30 cm from the left end, another is 6 kg positioned 70 cm from the left end. What is the position of the centre of mass of the beam (measured from the left end)?. Position of the centre of mass of the beam = 60 cm. Position of the centre of mass of the beam = 48 cm. Position of the centre of mass of the beam = 42 cm.

An aircraft component has a horizontal force of 50 Newtons applied to it. It also has a vertical force of 50 Newtons applied to it. What is the total amount of force that it must sustain?. Total force = 50 Newtons. Total force = 70.7 Newtons. Total force = 100 Newtons.

What mass, under gravity, can provide a 45 lb force?. 20.4 kg = 45 lb force. 99 kg = 45 lb force. 45 kg = 45 lb force.

If a vibrating body has a fundamental resonant frequency of 10 Hz, what are the harmonic frequencies of that vibrating body?. The harmonic frequencies of the vibrating body are 5 Hz, 2.5 Hz, ... The harmonic frequencies of the vibrating body are 20 Hz, 30 Hz, ... The harmonic frequencies of the vibrating body are 11 Hz, 12 Hz, ….

Which of these 'simple machines' principles is used in a screw thread system?. A screw thread system uses the pulley principle. A screw thread system uses the inclined plane principle. A screw thread system uses the lever principle.

What is the frequency of a pendulum that swings 1 cycle every 40 milliseconds?. Frequency of pendulum = 25 Hz. Frequency of pendulum = 0.04 Hz. Frequency of pendulum = 0.0025 Hz.

If the mass of a pendulum is increased, what happens to its time period of oscillation?. The time period of oscillation increases, if the mass of a pendulum is increased. The time period of oscillation decreases, if the mass of a pendulum is increased. The time period of oscillation is unchanged, if the mass of a pendulum is increased.

A truck driver slams on the brakes of a moving truck at a velocity v. As a result of his action the truck stops after traveling a distance d. If the driver had been traveling with twice the velocity (2v), what is the stopping distance compared to the distance in the first breaking action?. The stopping distance is two (2) times greater than the distance in the first breaking action. The stopping distance is four (4) times greater than the distance in the first breaking action. The stopping distance is the same as the distance in the first breaking action.

A container with a mass of 5 kg is lifted to a height of 8 m and then returned back to the ground level. How much work is done by the gravitational force?. Work done by the gravitational force = 400 J. Work done by the gravitational force = 800 J. Work done by the gravitational force = 0 J.

For a simple lever system to provide an ideal mechanical advantage (IMA) greater than unity, how must the effort be applied?. The effort must be applied at a greater distance from the pivot than the load. The effort must be applied at a smaller distance from the pivot than the load. The effort must be applied at the same distance from the pivot as the load.

A force of 5 N acting on an object causes it to move 20 metres in 4 seconds. What is the energy expended?. Energy expended = 80 J. Energy expended = 25 J. Energy expended = 100 J.

A force of 15 N is required to move a mass of 300 kg with a constant velocity. What is the value of the friction coefficient of the opposing force? (Take 'g' as 10m/s2). The friction coefficient of the opposing force = 0.005. The friction coefficient of the opposing force = 0.05. The friction coefficient of the opposing force = 20.

What is the unit of heat energy, according to the SI (Système International)?. The 'Joule' (J) is the unit of Energy, according to the SI. The 'Watt' (W) is the unit of Energy, according to the Sl. The 'British Thermal Unit' is the unit of Energy, according to the SI.

A certain force is applied to an object to make it move a certain distance. If the object is moved by the same force through the same distance but in a shorter time period, how are its power and work affected?. If the object is moved by the same force through the same distance but in a shorter time period, more power is expended but the same work is done. If the object is moved by the same force through the same distance but in a shorter time period, more work is done but the same power is expended. If the object is moved by the same force through the same distance but in a shorter time period, more work is done and more power is expended.

An object is taken from the Earth's gravity, to a planet where gravity is less. How does its mass and weight change?. Weight decreases, mass is unchanged, on a planet where gravity is less. Mass decreases, weight is unchanged, on a planet where gravity is less. Weight and mass both decrease, on a planet where gravity is less.

Two bowling balls collide head on, and bounce off each other. What kind of collision is this?. An 'inelastic' collision is when two balls collide and bounce off each other. An 'elastic' collision is when two balls collide and bounce off each other. A 'plastic' collision is when two balls collide and bounce off each other.

A 10 g arrow is fired with a velocity of 90 m/s from a bow with a mass of 2 kg. What is the impulse of the arrow?. Impulse = 0.9 Ns. Impulse = 20 Ns. Impulse = 180 Ns.

It is known that any gyro precesses when a torque is applied. How does the amount of precession vary?. The amount of precession varies directly proportional to the applied torque. The amount of precession varies directly proportional to the square of the applied torque. The amount of precession varies inversely proportional to the applied torque.

A force of 5 N is applied to an object for 3 seconds. What is the impulse?. Impulse = 1.67 Ns. Impulse = 15.0 Ns. Impulse = 0.6 Ns.

What does it mean if two substances have different specific gravities?. If two substances have different specific gravities, they have different densities. If two substances have different specific gravities, they have different volumes. If two substances have different specific gravities, they have different masses.

What is the value of the density of Aviation fuel, such as kerosene?. Greater than 1. Exactly 1. Less than 1.

What will happen to a low speed fluid flowing through a divergent duct?. Its velocity increases and its pressure increases. Its pressure increases and its velocity decreases. Its velocity increases and its pressure decreases.

If the dynamic pressure in a fluid flow is 3 bar and the static pressure is 1 bar, what is the total pressure?. 4 bar. 3 bar. 2 bar.

What are the three most common temperature scales?. Fahrenheit, Celsius, and Kelvin are the three most common temperature scales. Celsius, Kelvin, and Rankine are the three most common temperature scale. Fahrenheit, Celsius, and Rankine are the three most common temperature.

Temperature is a measure of what?. Temperature is a measure of the heat energy contained within a material. Temperature is a measure of the amount of internal kinetic energy in a material. Temperature is a measure of the amount of friction produced between two surfaces.

What does the second law of thermodynamics state?. The second law of thermodynamics states that the change of internal energy is energy added minus work done. The second law of thermodynamics states that the heat energy always flows from a hot body to a colder body. The second law of thermodynamics states that no internal energy exists at absolute zero.

What properties should an effective and efficient refrigerant have?. An effective and efficient refrigerant should have a high condensing pressure and a high evaporating temperature. An effective and efficient refrigerant should have a high condensing pressure and a low evaporating temperature. An effective and efficient refrigerant should have a low condensing pressure and a low evaporating temperature.

What is the term for the type of heat energy transferred, when the state (solid, liquid or gas) of a substance is changed?. Latent heat is the heat energy transferred, when the state (solid, liquid or gas) of a substance is changed. Specific heat is the heat energy transferred, when the state (solid, liquid or gas) of a substance is changed. Sensible heat is the heat energy transferred, when the state (solid, liquid or gas) of a substance is changed.

What happens to volume, according to Charles' Law?. Volume varies directly with temperature when pressure remains constant, according to Charles' Law. Volume varies inversely with temperature when pressure remains constant, according to Charles' Law. Volume is not affected by temperature when pressure remains constant, according to Charles' Law.

Which of the following processes is an adiabatic thermodynamic process?. A process where no heat is lost or gained through the system boundary is an adiabatic thermodynamic process. A process where no temperature is lost or gained in the system is an adiabatic thermodynamic process. A process where all heat is lost or gained through the system boundary is an adiabatic thermodynamic process.

Which material type generally expand the greatest amount, when subjected to an increase in temperature?. Solids generally expand the greatest amount, when subjected to an increase in temperature. Liquids generally expand the greatest amount, when subjected to an increase in temperature. Gases generally expand the greatest amount, when subjected to an increase in temperature.

What is the term for the definition of the heat generated when 1 kg of fuel is burned?. 'Radiant heat' is defined when 1 kg of fuel is burned. 'Latent heat' is defined when 1 kg of fuel is burned. 'Heat of combustion' is defined when 1 kg of fuel is burned.

A volume of 2m3 of gas at a pressure of 50 kPa and a temperature of 200 K is compressed by a piston inside a cylinder, to a volume of 1 m3 and a temperature of 400 K. How much does the pressure increase?. Pressure increases to 200 kPa. Pressure increases to 400 kPa. Pressure increases to 600 kPa.

When a ray of light goes from air to glass, Sin I/ Sin R is used to calculate what?. Sin I/ Sin R is used to calculate the Critical angle, when a ray of light goes from air to glass. Sin I/ Sin R is used to calculate the Refractive index, when a ray of light goes from air to glass. Sin I/Sin R is used to calculate the Reflective index, when a ray of light goes from air to glass.

How must the entry angle of light be adjusted, in order to travel down a fibreoptic cable without escaping?. The entry angle of light must be greater than the cone angle, in order to travel down a fibreoptic cable without escaping. The entry angle of light must be half of the cone angle, in order to travel down a fibreoptic cable without escaping. The entry angle of light must be the same or less than the cone angle, in order to travel down a fibreoptic cable without escaping.

How must the angle of incidence of the ray be set, so that total internal reflection occurs?. The angle of incidence of the ray must be set to exceed the critical angle for the medium, so that total internal reflection occurs. The angle of incidence of the ray must be set to be less than the critical angle for the medium, so that total internal reflection occurs. The angle of incidence of the ray must be set to be equal to the reflected angle, so that total internal reflection occurs.

How is a concave lens shaped?. A concave lens is thicker in the centre than its edge. A concave lens is thinner in the centre than its edge. A concave lens has a constant thickness from centre to edge.

If a ray of light enters glass with a refractive index of 1.5, what is the speed of the light in the glass?. The speed of the light in the glass = 200,000 kilometres per second. The speed of the light in the glass = 300,000 kilometres per second. The speed of the light in the glass = 400,000 kilometres per second.

What happens if two sound waves of equal amplitude overlap but one is a slightly different frequency from the other?. No sound will be heard, if two sound waves of equal amplitude overlap but one is a slightly different frequency from the other. Twice the volume of one of the sound waves will be heard, if two sound waves of equal amplitude overlap but one is a slightly different frequency from the other. A beat frequency will be heard, if two sound waves of equal amplitude overlap but one is a slightly different frequency from the other.

What is the point where there is no displacement, when a string vibrates with a standing wave?. A Node is the point where there is no displacement, when a string vibrates with a standing wave. An Anti-node is the point where there is no displacement, when a string vibrates with a standing wave. A Harmonic is the point where there is no displacement, when a string vibrates with a standing wave.

What is the value of the wavelength of the 1st overtone frequency of a vibrating string?. The wavelength of the 1st overtone frequency of a vibrating string is the same as the wavelength of the fundamental frequency. The wavelength of the 1st overtone frequency of a vibrating string is half to the wavelength of the fundamental frequency. The wavelength of the 1st overtone frequency of a vibrating string is twice the wavelength of the fundamental frequency.

What is the value of the speed of sound, when measured in standard atmospheric temperature and pressure conditions?. The speed of sound is 340 km/s, when measured in standard atmospheric temperature and pressure conditions. The speed of sound is 3,400 m/s, when measured in standard atmospheric temperature and pressure conditions. The speed of sound is 340 m/s, when measured in standard atmospheric temperature and pressure conditions.

What is the overall charge on an ion that has gained electrons?. An ion that has gained electrons has a positive charge. An ion that has gained electrons has a negative charge. An ion that has gained electrons has a neutral charge.

Which group of elements usually forms negative ions in ionic bonds?. Alkali metals usually form negative ions in ionic bonds. Transition metals usually form negative ions in ionic bonds. Halogens usually form negative ions in ionic bonds.

How is the difference between the mass and atomic numbers related to neutrons in a nucleus?. The difference between the mass and atomic numbers gives the total number of nucleons. The difference between the mass and atomic numbers represents the total charge of the nucleus. The difference between the mass and atomic numbers indicates the number of neutrons present.

What happens when atoms combine due to an attractive force?. When atoms combine due to an attractive force, they repel each other. When atoms combine due to an attractive force, they form small covalent molecules. When atoms combine due to an attractive force, they form chemical bonds.

Two load vectors are at 90 degrees to each other, having magnitudes of 6N and 8N respectively. What is the resultant load vector?. The resultant load vector = 6 N. The resultant load vector = 8N. The resultant load vector = 10 N.

Which phases of matter have the strongest inter-molecular forces?. Gases have the strongest inter-molecular forces. Liquids have the strongest inter-molecular forces. Solids have the strongest inter-molecular forces.

What will happen to the weight of an object that is moved from air into water?. Weight increases when an object that is moved from air into water. Weight decreases when an object that is moved from air into water. Weight is unchanged when an object that is moved from air into water.

What kind of force is a reversed 'tensile force'?. A torsional force is a reversed 'tensile force. A shear force is a reversed 'tensile force'. A compressive force is a reversed 'tensile force'.

Why does an object sink to the bottom of a body of water?. An object sink to the bottom of a body of water when the object is heavier than the water. An object sink to the bottom of a body of water when the object is denser than the water. An object sink to the bottom of a body of water when the object is smaller than the water.

What happens if an aircraft's CG is located outside of the designated limits?. If an aircraft's CG is located outside of the designated limits, it may be difficult to control or increased fuel consumption or both. If an aircraft's CG is located outside of the designated limits, it may have increased stability during flight. If an aircraft's CG is located outside of the designated limits, it may have improved maneuverability.

What is the acceleration of an object that is rotating in a circle at a constant angular speed?. An object that is rotating in a circle at a constant angular speed is not accelerating in any direction since its angular speed is constant. An object that is rotating in a circle at a constant angular speed is accelerating at a constant rate in a direction towards the centre of rotation. An object that is rotating in a circle at a constant angular speed is accelerating at a constant rate in a direction away from the centre of rotation.

What is the velocity of a shaft revolving at 600 revolutions per minute?. The velocity of a shaft revolving at 600 revolutions per minute = 10π radians/second. The velocity of a shaft revolving at 600 revolutions per minute = 4π radians/second. The velocity of a shaft revolving at 600 revolutions per minute = 20π radians/second.

What is the unit for measuring angles when performing physics calculations?. The unit for measuring angles when performing physics calculations is 'Degrees'. The unit for measuring angles when performing physics calculations is 'Revolutions'. The unit for measuring angles when performing physics calculations is 'Radians'.

In the absence of a net external force, how does a moving object react?. A moving object slows down and eventually stops, in the absence of a net external force. A moving object moves at constant speed indefinitely, in the absence of a net external force. A moving object accelerates gradually at a constant rate, in the absence of a net external force.

A net force 'F' accelerates a mass 'm' with an acceleration 'a'. If the same net force is applied to mass '2m', what is its acceleration?. Acceleration = 4a. Acceleration = 2a. Acceleration a/2.

A force of 5 N acting on an object causes it to move 20 metres in 4 seconds. What is the power generated?. Power generated = 50 Watts. Power generated = 8 Watts. Power generated = 25 Watts.

Each second a propeller accelerates an air mass of 100 kg from rest to a velocity of 20 m/s. How much thrust is provided?. Thrust 2,000 N. Thrust 40,000 N. Thrust 1,000 N.

Upon what does the amount of friction between two surfaces depend?. The amount of friction between two surfaces depends upon the force pushing the surfaces together, and the area of contact of the surfaces. The amount of friction between two surfaces depends upon the area of contact of the surfaces and the type of surfaces in contact. The amount of friction between two surfaces depends upon the type of surfaces in contact and the force pushing the surfaces together.

Two football players, one 70 kg, the other 90 kg, are running at 5 m/s. If they are both heading in the same direction, what is their total momentum?. Total momentum = 800 kgm/s. Total momentum = 100 kgm/s. Total momentum = 31,500 kgm/s.

By what term is 'rolling resistance' also known?. 'Rolling resistance' is also known as Static friction. 'Rolling resistance' is also known as Dynamic friction. 'Rolling resistance' is also known as Sliding friction.

Specific gravity of a substance is a measure of its density relative to what fluid medium?. Specific gravity of a substance is a measure of its density relative to Water. Specific gravity of a substance is a measure of its density relative to Air. Specific gravity of a substance is a measure of its density relative to a Vacuum.

If a 10 kg block of steel is heated from 30 °C to 150 °C, what happens to its density?. Density increases. Density decreases. Density is unchanged.

For which of the following would you use Bernoulli's principle?. To easily predict the amount of lift on an aeroplane wing. To easily predict the amount of thrust from a jet engine. To easily predict the amount of lift or buoyancy of a hot air balloon.

How does pressure, sensed by Pitot tube, relate to static pressure?. Pitot pressure is always greater than dynamic pressure. Pitot pressure is sometimes equal to static pressure. Pitot pressure is always greater than static pressure.

All thermodynamic calculations and formulae must use temperatures measured in which standard scale?. All thermodynamic calculations and formulae must use temperatures measured in Fahrenheit. All thermodynamic calculations and formulae must use temperatures measured in Celsius. All thermodynamic calculations and formulae must use temperatures measured in Kelvin.

How is heat transferred by convection?. Heat transfers by convection via a transfer of kinetic energy of the molecular particles. Heat transfers by convection via a physical movement of material. Heat transfers by convection via electromagnetic waves through the materials.

What happens when a pressurised gas expands?. When a pressurised gas expands, it can do work. When a pressurised gas expands, its temperature increases. When a pressurised gas expands, work is done on it.

1 kg of ice at 0 °C has how much volume compared to water?. 1 kg of ice at 0 °C has more volume than water at 0 °C. 1 kg of ice at 0 °C has less volume than water at 0 °C. 1 kg of ice at 0 °C has the same volume as water at 0 °C.

What remains constant, in the Brayton cycle (gas turbine cycle), as heat is being added?. The temperature remains constant, in the Brayton cycle, as heat is being added. The volume remains constant, in the Brayton cycle, as heat is being added. The pressure remains constant, in the Brayton cycle, as heat is being added.

What type of optic index has a fibre optic cable which has a sudden change in the refractive index at the cladding-core interface?. A graded index type fibre optic cable has a sudden change in the refractive index at the cladding core interface. A step index type fibre optic cable has a sudden change in the refractive index at the cladding - core interface. A dual index type fibre optic cable has a sudden change in the refractive index at the cladding-core interface.

How will the image be formed, when an object is placed more than twice the focal length beyond a converging lens?. The image formed is inverted, smaller than the object and real, when an object is placed more than twice the focal length beyond a converging lens. The image formed is erect, smaller than the object and real, when an object is placed more than twice the focal length beyond a converging lens. The image formed is inverted, larger than the object and virtual, when an object is placed more than twice the focal length beyond a converging lens.

What is the name of the phenomenon of the change in direction of a light ray that passes across the boundary between two transparent substances with different densities?. 'Reflection', is the change in direction of a light ray that passes across the boundary between two transparent substances with different densities. 'Defraction', is the change in direction of a light ray that passes across the boundary between two transparent substances with different densities. 'Refraction', is the change in direction of a light ray that passes across the boundary between two transparent substances with different densities.

What is another name for the first overtone of a sound wave?. '1st harmonic' is another name for the first overtone of a sound wave. 'Fundamental frequency' is another name for the first overtone of a sound wave. '2nd harmonic' is another name for the first overtone of a sound wave.

Which of these conditions does a standing wave need to meet in order to exist?. The phase difference between the wave and the reflected wave must be in, in order for a standing wave to exist. The phase difference between the wave and the reflected wave must be zero, in order for a standing wave to exist. The frequency of the wave and the reflected wave must be different, in order for a standing wave to exist.

Which term refers to the vertical columns in the periodic table?. The vertical columns in the periodic table are known as the Periods. The vertical columns in the periodic table are known as the Groups. The vertical columns in the periodic table are known as the Blocks.

What is the electrical charge of an atom which is deficient of one or more electrons?. An atom which is deficient of one or more electrons is positively charged. An atom which is deficient of one or more electrons is neutrally charged. An atom which is deficient of one or more electrons is negatively charged.

What is Brownian motion?. Brownian motion is the movement of particles in solids and liquids due to heat energy. Brownian motion is the movement of particles in gases due to electromagnetic fields. Brownian motion is the movement of particles in fluids due to random collisions with other particles.

What does the 'yield point of a material under strain, represent?. The point at which the material breaks due to the load, is the 'yield point'. The point at which strain becomes proportional to stress, is the 'yield point'. The point at which a permanent deformation takes place, is the 'yield point'.

How many kilograms make 45 pounds (lb)?. 20.4 kg = 45 lb. 99 kg = 45 lb. 441 kg 45 lb.

How heavy is one tonne (t)?. 1000 kilograms (kg) = 1 t. 1000 Newtons (N) = 1 t. 1000 grams (g) = 1 t.

When a structural component is subjected to a twisting force, to what kind of stress is it subjected?. Compression stress is caused by a twisting force. Bending stress is caused by a twisting force. Torsion stress is caused by a twisting force.

If a pilot applies a couple of 20 Nm to turn a control wheel which is 0.4 m wide, what is the magnitude of just one of the hand forces applied by the pilot?. One of the hand forces applied by the pilot is 4 N. One of the hand forces applied by the pilot is 50 N. One of the hand forces applied by the pilot is 25 N.

What is the acceleration of a mass of 300 kg, when a horizontal force of 60 N acts upon it? (Assume no frictional forces). Acceleration = 0.2 m/s2. Acceleration = 5 m/s2. Acceleration = 18 km/s2.

An object is thrown straight up. Which of the following is true about the work done by the gravitational force, while the object moves up and then down?. Work is positive on the way up, work is positive on the way down. Work is negative on the way up, work is positive on the way down. Work is positive on the way up, work is negative on the way down.

A cyclist starts from rest and reaches 84 m/s in 3 seconds. What is the cyclist's acceleration?. Cyclist's acceleration = 28 m/s2. Cyclist's acceleration = 14 m/s2. Cyclist's acceleration = 252 m/s2.

Upon what does the time period of a pendulum swing depend?. The time period of a pendulum swing depends upon the earth's gravity and the pendulum's mass. The time period of a pendulum swing depends upon the earth's gravity and a the pendulum's length. The time period of a pendulum swing depends upon the earth's gravity, the pendulum's mass and length.

'Every action has an equal and opposite reaction' is the description of which law?. Conservation of Energy is described by 'Every action has an equal and opposite reaction'. Newton's Third Law is described by 'Every action has an equal and opposite reaction. Newton's First Law is described by 'Every action has an equal and opposite reaction'.

A rate gyro is used in a turn coordinator. Which property of the gyro is used to measure the turn rate?. The property of 'Rigidity' is used to measure the turn rate in a turn coordinator. The property of 'Precession' is used to measure the turn rate in a turn coordinator. The property of 'Rotation' is used to measure the turn rate in a turn coordinator.

In how many planes can a rate gyro move? (other than its plane of rotation)?. A rate gyro moves in 1 plane only. A rate gyro moves in 2 planes. A rate gyro moves in 3 planes.

Upon what is kinematic viscosity dependent?. Pressure. Volume. Density.

The Kelvin scale has the same incremental subdivisions as which other standard scale?. The Kelvin scale has the same incremental subdivisions as the Celsius scale. The Kelvin scale has the same incremental subdivisions as the Fahrenheit scale. The Kelvin scale has the same incremental subdivisions as the Rankine scale.

What is the term for the type of heat energy transferred, when there is a change of the temperature of a substance?. Latent heat is the heat energy transferred when there is a change of the temperature of a substance. Specific heat is the heat energy transferred when there is a change of the temperature of a substance. Sensible heat is the heat energy transferred when there is a change of the temperature of a substance.

An aluminium fuel tank is 100% full with fuel. If the temperature of the fuel and the tank increases, what happens?. The tank will overflow if the coefficient of volumetric expansion of the fuel is greater than the coefficient of volumetric expansion of aluminium. The tank will overflow if the coefficient of volumetric expansion of aluminium is greater than the coefficient of volumetric expansion of the fuel. The tank will not overflow if the aluminium tank and the fuel experience the same increase in temperature.

A ring of aluminium has an internal diameter of 5 cm. When heated, what happens to its internal diameter?. Its internal diameter does not change when heated. Its internal diameter decreases when heated. Its internal diameter increases when heated.

What is the term for the energy that is unavailable to do work, during a thermodynamic process?. 'Internal energy' is the energy that is unavailable to do work, during a thermodynamic process. 'Latent energy' is the energy that is unavailable to do work, during a thermodynamic process. 'Entropy' is the energy that is unavailable to do work, during a thermodynamic process.

What does a refrigerant do when it is absorbing heat from its surroundings?. A refrigerant evaporates when it is absorbing heat from its surroundings. A refrigerant condenses when it is absorbing heat from its surroundings. A refrigerant freezes when it is absorbing heat from its surroundings.

Which of the following electromagnetic frequency energy types travel at the greatest speed, in any given medium?. X-ray energy travels at the greatest speed, in any given medium. Visible light energy travels at the greatest speed, in any given medium. Energy of all electromagnetic frequencies travel at the same speed, in any given medium.

What happens if the frequency of a sound wave is increased?. The volume (loudness) of the sound increases if the frequency of a sound wave is increased. The speed of the sound increases if the frequency of a sound wave is increased. The pitch of the sound increases if the frequency of a sound wave is increased.

A loud train is approaching you at high speed whilst you stand stationary on the station platform. As the train passes you, how does the pitch of its sound vary?. Pitch increases as the train passes. Pitch decreases as the train passes. Pitch does not change as the train passes.

What happens if the amplitude of a sound wave is increased?. The volume (loudness) of the sound increases if the amplitude of a sound wave is increased. The travel speed of the sound increases if the amplitude of a sound wave is increased. The pitch of the sound increases if the amplitude of a sound wave is increased.

In a sound wave in which the molecular vibrations are perpendicular to, or lateral to, the direction of sound travel, is what kind of a wave?. A Transverse wave, is a wave in which the molecular vibrations are perpendicular to, or lateral to, the direction of sound travel, is what kind of a wave. An Upright wave, is a wave in which the molecular vibrations are perpendicular to, or lateral to, the direction of sound travel, is what kind of a wave. A Longitudinal wave, is a wave in which the molecular vibrations are perpendicular to, or lateral to, the direction of sound travel, is what kind of a wave.