WorksheetsBasic Physics
Total questions: 32
Worksheet time: 16mins
Which will weigh the least?
98 parts of dry air and 2 parts of water vapor.
35 parts of dry air and 65 parts of water vapor.
50 parts of dry air and 50 parts of water vapor.
The purpose of stall strips on airplane wings is to
increase lift in the areas of installation
prevent stall in the areas of installation.
ensure that the wing root areas stall first.
What is absolute humidity?
The temperature to which humid air must be cooled at constant pressure to become saturated
The actual amount of the water vapor in a mixture of air and water
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
The main rotor system on a helicopter is classified in three groups. Which of those listed is NOT one of these groups?
The fully articulated rotor system.
The flexible-beam rotor system.
The semi-rigid rotor system.
Which statement concerning heat and/or temperature is true?
There is an inverse relationship between temperature and heat
Temperature is a measure of the kinetic energy of the molecules of any substance
Temperature is a measure of the potential energy of the molecules of any substance.
(Refer to Figure 61.) The amount of force applied to rope A to lift the weight is
12 pounds
15 pounds
20 pounds
The desired effect of using winglets on an aircraft's wingtips is to
increase the lift to drag ratio
reduce the aspect ratio.
optimize wing dihedral and improve lateral stability
If both the volume and the absolute temperature of a confined gas are doubled, the pressure will
not change
be halved
become four times as great
Under which conditions will the rate of flow of a liquid through a metering orifice (or jet) be the greatest (all other factors being equal)?
Unmetered pressure, 18 PSI; metered pressure, 17.5 PSI; atmospheric pressure, 14.5 PSI
Unmetered pressure, 23 PSI; metered pressure, 12 PSI; atmospheric pressure, 14.3 PSI
*Unmetered pressure, 17 PSI; metered pressure, 5 PSI; atmospheric pressure, 14.7 PSI.
The purpose of aircraft wing dihedral is to
increase lateral stability.
increase longitudinal stability.
increase lift coefficient of the wing.
The speed of sound in the atmosphere
varies according to the frequency of the sound
changes with a change in temperature.
changes with a change in pressure.
If the volume of a confined gas is doubled (without the addition of more gas), the pressure will (assume the temperature remains constant)
increase in direct proportion to the volume increase.
remain the same.
be reduced to one-half its original value.
If the temperature of a confined liquid is held constant and its pressure is tripled,the volume will
triple.
be reduced to one-third its original volume.
*remain the same.
Which condition is the actual amount of water vapor in a mixture of air and water?
Relative humidity.
Dewpoint.
Absolute humidity.
Which atmospheric conditions will cause the true landing speed of an aircraft to be the greatest?
Low temperature with low humidity.
High temperature with low humidity.
High temperature with high humidity.
Aspect ratio of a wing is defined as the ratio of the
wingspan to the wing root.
square of the chord to the wingspan.
wingspan to the mean chord.
In physics, which of the following factors are necessary to determine power?
1. Force exerted.
2. Distance moved.
3. Time required.
1 and 2.
2 and 3.
1, 2, and 3.
If all, or a significant part of a stall strip is missing on an airplane wing, a likely result will be
asymmetrical lateral control at or near stall angles of attack
decreased lift in the area of installation at high angles of attack.
asymmetrical lateral control at low angles of attack.
Which of the following statements are correct?
When the cyclic pitch control lever is raised, the blade angle of all the rotor blades increases uniformly and they create the lift that allows the helicopter to take off vertically
When the collective pitch control lever is raised, the blade angle of all the rotor blades increases uniformly and they create the lift that allows the helicopter to take off vertically
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
20- 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
4,000 pounds.
8,000 pounds.
800 pounds.
Which of the following is NOT considered a method of heat transfer?
Convection.
Conduction.
Diffusion.
An engine that weighs 350 pounds is removed from an aircraft by means of a mobile hoist. The 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?
840 foot-pounds.
1,890 foot-pounds.
1,050 foot-pounds.
An airplane wing is designed to produce lift resulting from
positive air pressure below and above the wing's surface along with the downward deflection of air
positive air pressure below the wing's surface and negative air pressure above the wing's surface along with the downward deflection of air
negative air pressure below the wing's surface and positive air pressure above the wing's surface along with the downward deflection of air.
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?
Absolute humidity.
Relative humidity.
Dewpoint.
Which of the following is Newton's First Law of Motion, generally termed the Law of Inertia?
To every action there is an equal and opposite reaction.
Force is proportional to the product of mass and acceleration.
Every body persists in its state of rest, or of motion in a straight line, unless acted upon by some outside force.
A wing with a very high aspect ratio (in comparison with a low aspect ratio wing) will have
increased drag at high angles of attack.
a low stall speed.
poor control qualities at low airspeeds.
The boiling point of a given liquid varies
directly with pressure.
inversely with pressure.
directly with density.
The temperature to which humid air must be cooled at constant pressure to become saturated is called
dewpoint.
absolute humidity.
relative humidity.
If a double-acting actuating cylinder in a 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?
9,000 pounds.
6,000 pounds.
3,000 pounds.
The speed of sound in the atmosphere is most affected by variations in which of the following?
1. Sound frequency (cps).
2. Ambient temperature.
3. Barometric pressure
1
2
3
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)?
L ÷ I = R ÷ E
L = Length of ramp, measured along the slope.
I = Height of ramp.
R = Weight of object to be raised or lowered.
E = Force required to raise or lower objects
40 pounds
120 pounds
360 pounds
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?
120 pounds of force.
360 foot-pounds.
40 foot-pounds
