If a container of fluid gas is compressed to 1/2 its original volume, and the temperature is the same, what happens to the pressure?
Increases by 2
How much work is required to slowly lower a 120 pound weight from a 3 foot table?
360
Work = Force x Distance
How are temperature and heat related?
Temperature is a measure of how much of how much heat something has.
Wing Dihedral is used to:
Increase stability of a wing
Flaps are trailing edge wing devices that:
Modify the chord to generate more lift
The speed of sound in air depends on:
Temperature
A first class lever with a fulcrum dead center is used to lift a 50 pound crate. If you push it down 2 feet, how far up does the crate move?
2 feet
When does an engine generate the most power?
On the ground, in dry air
A single pulley mounted to the ceiling is lifting a 10 pound crate. If the crate moves up 2 feet:
2 feet of rope is pulled and 20 foot-pounds of work is done
The ability of a wing to generate lift is:
Related to its wing cross-section shape
Air compressors generate compressed air, but it becomes hot in the tank. Why?
Gas laws say pressure and temperature increase together in a constant volume.
What is the purpose of gears?
Transfer power in many different ways
Sources of heat include:
The sun, friction, and electrical current
(things that CREATE heat)
Why do aircraft use hydraulic systems?
Incompressible liquids allow us to transfer force into difficult to access areas
In a venturi, gas pressure decreases and velocity increases as the cross section decreases. This is because:
The total energy of the gas cannot change
50 pounds of force is applied to a piston that has 10 square inches of area. On the other end of the closed system, a 100 square inch piston moves up. Which statement is true?
The big piston moves 10% the distance of the small piston, due to fluid displacement.
High wing aircraft don’t need fuel pumps because:
The fuel is stored in the wings and hydrostatic pressure is enough for the engine to start.
Oil and coolant fluids are notable because they:
Have a high specific heat, and can store large amounts of waste heat.
Aircraft engines lose power as they ascend, because the atmosphere loses oxygen density. What else also decreases as altitude increases?
The air drag due to speed and air density.
Newton’s third law states that for every action there is an equal and opposite reaction. If i stand of the floor, I do not fall through the floor. Why?
The floor pushes back on me with a force equal to my weight.
Why is the speed of sound so important to aviation?
Fluid characteristics change at the speed of sound, so aircrafts have to be specially designed.
Cut-away sections views are used to:
Show the internal, hidden components
Frame Stations for airplanes are used to:
Can you manufacture this part using only the blueprints?
Not if the dimensions are missing
