Basic Physics Flashcards by Molly Haag

If the double-acting actuating cylinder in 3,000 PSI system has a piston with a surface area of three square inches on the extension side, and a rod with a cross-section area of one square inch attached to the piston on the other side, approximately how much force will the actuator be able to produce when retracting?
A. 9,000 pounds.
B. 6,000 pounds.
C. 3,000 pounds.

B. 6,000 pounds.

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The boiling point of a given liquid varies:
A. Directly with pressure.
B. Inversely with pressure.
C. Directly with density.

A. Directly with pressure.

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Which of the following is NOT considered a method of heat transfer?
A. Convection.
B. Conduction.
C. Diffusion.

C. Diffusion.

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An engine that weighs 350 pounds is removed from an aircraft by means of a mobile hoist. He engine is raised 3 feet above its attachment mount, and the entire assembly is then moved forward 12 feet. A constant force of 70 pounds is required to move the loaded hoist. What is the total work input required to move the hoist?
A. 840 foot-pounds.
B. 1,890 foot-pounds.
C. 1,050 foot-pounds.

A. 840 foot-pounds.

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Which condition is the actual amount of water vapor in a mixture of air and water?
A. Relative humidity.
B. Dew point.
C. Absolute humidity.

C. Absolute humidity.

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Under which conditions will the rate of flow of a liquid through a metering orifice (or jet) be the greatest a (all other factors being equal)?
A. Unmetered pressure, 18 psi; metered pressure, 17.5 psi; atmospheric pressure, 14.5.
B. Unmetered pressure, 23 psi; metered pressure, 12 psi; atmospheric pressure, 14.3 psi.
C. Unmetered pressure, 17 psi; metered pressure, 5 psi; atmospheric pressure, 14.7.

C. Unmetered pressure, 17 psi; metered pressure, 5 psi; atmospheric pressure, 14.7.

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(Refer to figure 61) The amount of force applied to top A to lift the weight is:
A. 12 pounds.
B. 15 pounds.
C. 20 pounds.

B. 15 pounds.

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Which will weight the least?
A. 98 parts of dry air and 2 parts of water vapor.
B. 35 parts of dry air and 65 parts of water vapor.
C. 50 parts of dry air and 50 parts of water vapor.

B. 35 parts of dry air and 65 parts of water vapor.

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Which is the ratio of the water vapor actually present in the atmosphere to the amount that would be present if the air were saturated at the prevailing temperature and pressure?
A. Absolute humidity.
B. Relative humidity.
C. Dew point.

B. Relative humidity.

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The speed of sound in the atmosphere:
A. Varies according to the frequency of the sound.
B. Changes with a change in temperature.
C. Changes with a change in pressure.

B. Changes with a change in temperature.

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The speed of sound in the atmosphere is most affected by variations in which of the following?
A. Sound frequency.
B. Ambient temperature.
C. Barometric pressure.

B. Ambient temperature.

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If the volume of a confined gas is doubled (without the addition of more gas), the pressure will (assume the temperature remains constant):
A. Increase in direct proportion to the volume increase.
B. Remain the same.
C. Be reduced to one-half its original value.

C. Be reduced to one-half its original value.

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If the temperature of a confined liquid is held constant and its pressure its tripled, the volume will:
A. Triple.
B. Be reduced to one-third its original volume.
C. Remain the same.

C. Remain the same.

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How much work input is required to lower (not drop) a 120-pound weight from the top of a 3-foot table to the floor?
A. 120 pounds of force.
B. 360 foot-pounds.
C. 40 foot-pounds.

B. 360 foot-pounds.

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Which atmospheric conditions will cause the true landing speed of an aircraft to be aircraft to be the greatest?
A. Low temperature with low humidity.
B. High temperature with low humidity.
C. High temperature with high humidity.

C. High temperature with high humidity.

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If the fluid pressure is 800 psi in a 1/2-inch line supplying an actuating cylinder with a piston area of 10 square inches, the force exerted on the piston will be:
A. 4,000 pounds.
B. 8,000 pounds.
C. 800 pounds.

B. 8,000 pounds.

In physics, which of the following factors are necessary to determine power?
A. Force exerted, distance moved, and work.
B. Distance moved and time required.
C. Force exerted, distance moved, and time required.

C. Force exerted, distance moved, and time required.

What force must be applied to roll a 120-pound barrel up an inclined plane 9 feet long to a height of 3 feet (disregard friction)?
A. 40 pounds.
B. 120 pounds.
C. 360 pounds .

A. 40 pounds.

Which statement concerning heat and/or temperature is true?
A. There is an inverse relationship between temperature and heat.
B. Temperature is measure of the kinetic energy of the molecules of any substance.
C. Temperature is a measure of the potential energy of the molecules of any substance.

B. Temperature is measure of the kinetic energy of the molecules of any substance.

What is absolute humidity?
A. The temperature to which humid air must be cooled at constant pressure to become saturated.
B. The actual amount of the water vapor in a mixture of air and water.
C. The ratio of the water vapor actually present in the atmosphere to the amount that would be present if the air were saturated at the prevailing temperature and pressure.

B. The actual amount of the water vapor in a mixture of air and water.

The temperature to which humid air must be cooled at constant pressure to become saturated is called:
A. Dew point.
B. Absolute humidity.
C. Relative humidity.

A. Dew point.

If both the volume and the absolute temperature of a confined gas are doubled. The pressure will:
A. Not change.
B. Be halved.
C. Become four times as great

A. Not change.

If all, or a significant part of a stall strip is missing on an airplane wing, a likely result:
A. Asymmetrical lateral control at or near stall angles of attack.
B. Decreased lift in the area of installation at high angles of attack.
C. Asymmetrical lateral control at low angles of attack.

A. Asymmetrical lateral control at or near stall angles of attack.

the purpose of stall strips on airplane wings is to:
A. Increase lift in the areas of installation.
B. Prevent stall in areas of installation.
C. Ensure that the wing root areas stall first.

C. Ensure that the wing root areas stall first.

An airplane wing is designed to produce lift resulting from: A. Positive air-resurrect below and above the wing’s surface along with the downward deflection of air. B. Positive air pressure below the wing’s surface and negative air pressure above the wing’s surface along with the downward deflection of air. C. Negative air pressure below the wing’s surface and positive air pressure above the wing’s surface along with the downward deflection of air.

B. Positive air pressure below the wing’s surface and negative air pressure above the wing’s surface along with the downward deflection of air.

Which of the following is Newton’s first law of motion, generally termed the law of inertia? A. To every action there is an equal and opposite reaction. If a force is applied to an object, the object will supply a resistive force exactly equal to and in the opposite direction of the force applied. B. Force is proportional to the product of mass and acceleration. When a force acts upon a body, the momentum of that body is changed. C. Objects at rest tend to remain at rest and objects in motion tend to remain in motion at the same speed and in the same direction, unless acted on by an external force.

C. Objects at rest tend to remain at rest and objects in motion tend to remain in motion at the same speed and in the same direction, unless acted on by an external force.

The purpose of aircraft wing dihedral is to; A. Increase lateral stability. B. Increase longitudinal stability. C. Increase lift coefficient of the the wing.

A. Increase lateral stability.

Aspects ratio of a wing is defined as the ratio of the; A. Wingspan to the sing root. B. Square of the chord to the wingspan. C. Increase lift coefficient of the wing.

C. Increase lift coefficient of the wing.

A wing with a very high aspect ratio (in comparison with a low aspect ratio wing) will have: A. Increased drag at high angles of attack. B. A low stall speed. C. Poor control qualities at low airspeeds.

B. A low stall speed.

The desired effect of using winglets on an aircraft’s wingtips is to, A. Increase the lift to drag ratio. B. Reduce the aspect ratio. C. Optimize wing dihedral and improve lateral stability.

A. Increase the lift to drag ratio.

The main rotor system on a helicopter is classified in these groups. Which of those listed is NOT one of these groups? A. The fully articulated rotor system. B. The flexible-beam rotor system. C. The semi-rigid rotor system.

B. The flexible-beam rotor system.

Which of the following statements is correct? A. When the cyclic pitch control lever is raised, the blade angle of all the rotor blades increases uniformity and they create the lift that allows the helicopter to take off vertically. B. When the collective pitch control lever is raised, the blade angle of all the rotor blades increase uniformly and they create the lift that allows the helicopter to take off vertically. C. When the collective pitch control lever is raised, the blade angle of the aft rotor blades decreases uniformly and they create the lift that allows the helicopter to take off vertically.

B. When the collective pitch control lever is raised, the blade angle of all the rotor blades increase uniformly and they create the lift that allows the helicopter to take off vertically.