Physics

Question 1

What are the three types of heat transfer?

Answer 1

Conduction, Convection and Radiation.

Question 2

What is the atmospheric pressure on a standard day at sea level?

Answer 2

14.7 PSI or 29.92 inches of Mercury or 1013.2 millibars

Question 3

How is pressure expressed in hydraulic and pneumatics?

Answer 3

PSI

Question 4

What types of matter are affected by thermal expansion?

Answer 4

Solid, Liquid and Gases.

Question 5

Are liquids compressible?

Answer 5

No.

Question 6

What is the basic Pascal ́s law formula for computing force, given pressure and area?

Answer 6

Force = Pressure x Area.

Question 7

In what direction is pressure transmited when force is applied to a confined fluid?

Answer 7

Equally in all directions.

Question 8

What are three states of matter?

Answer 8

Solid, Liquid and Gases.

Question 9

What is the term used to describe the ratio of the amount of water vapor actually present in the atmosphere as compared to when the air is saturated with water vapor?

Answer 9

Relative Humidity.

Question 10

On a standard day, temperature in degrees Fahrenheit/Centigrade is?

Answer 10

59°F and 15°C.

Question 11

What factors determine density altitude

Answer 11

Pressure and Atmospheric Temperature.

Question 12

What is the approximate speed of sound on a standard day at sea level?

Answer 12

767 MPH.
340 Meters/sec. or
661.7 knots.

Question 13

What is the definition of friction?

Answer 13

Opposition to the relative movement between two objects.

Question 14

What does a basic lever machine consists of?

Answer 14

It is a rigid bar and a pivot point called the fulcrum.

Question 15

How does blade flapping help compensate for disymmetry of lift in helicopter main rotor systems?

Answer 15

Serves to increase the angle of attack and lift on the retaining blade of the rotor and decrease the angle of attack and the lift on the advancing blade side.

Question 16

What are the four principal forces acting on an airplane in flight?

Answer 16

Lift, Drag, Thrust and Gravity.

Question 17

What is a British Thermal Unit?

Answer 17

The amount of heat energy required to change the temperature of 1 pound of water 1°Fahrenheit.

Question 18

A wheelbarrow is an exemple of what class of lever?

Answer 18

A second-class lever.

Question 19

What is the angle between the chord line of an airfoil and the direction of the relative wind called?

Answer 19

Angle of attack.

Question 20

Define matter.

Answer 20

Any substance that occupies space and has a mass.

Question 21

Define kinetic energy:

Answer 21

It is the energy of motion.

Question 22

Work is a product of what two factors?,

Answer 22

Force and the Distance moved

Question 23

What causes an airplane wing to stall?

Answer 23

A stall is caused by the separation of the airflow across the top of the wing from the wing upper Surface when the angle of attack exceeds a critical value.

Question 24

What effects do the lowering of flaps have on airplane in flight.

Answer 24

Lift increases, drag increases and the stall speed decreases.

Question 25

What function do wing Mounted Vortex Generators provide?

Answer 25

Vortex generators serve to delay or keep the air flow from separating from the upper surface of the wings during high- speed flights.

Question 26

What term defines the temperature at which all molecular motion ceases?

Answer 26

Absolute ZERO.

Question 27

What change occurs in the flow of air through the main rotor system of a helicopter when transitioning from normal flight to auto rotation?

Answer 27

During normal flight the air moves downward and during auto rotation the air moves upward.