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The plane is once more flying straight ahead. You decide to make the plane rise quickly. You tip the nose up suddenly, hoping it ascends. However,...
The plane is once more flying straight ahead. You decide to make the plane rise quickly. You tip the nose up suddenly, hoping it ascends. However, the plane practically stops in midair and falls. What happened?
A.The force required by the rise in angle cannot be met by the lift.
B.The airstream separated from the top of the wing and it stalled.
C.Somebody shot at the plane.
D.Tilting the plane up makes the body of the plane present itself full into the wind causing a huge drag.
After this latest disaster, you decide to go for broke and try a very expensive model jet plane. You rapidly accelerate the plane to 300 miles per hour. From the plane s perspective the air is passing by at 300 mph. Describe the speed and pressure of the air entering the large inlet duct of the jet engine.
A.The air pressure at the entrance duct is higher, and the speed lower.
B.The air pressure at the entrance duct is lower, and the speed lower.
C. The air pressure at the entrance duct is higher, and the speed higher
D.The air pressure at the entrance duct is lower, and the speed higher.
You move to the tarmac where they are getting ready to shoot two identical rockets up into the air. One rocket is supported by a large steel plate, while the other is supported over a hole into the ground. You bet someone the rocket over the steel plate will rise faster than the other rocket. After ignition the one rocket s plume of burning fuel hits the plate while the other one goes into the deep hole. You are shocked that they rise together at the same rate. The reason this happens is:
A.The engine of the rocket on the plate is clearly weaker than the other rocket
B.The rocket engine provides a thrust force upward, by expelling large amounts of mass in the down direction.
C.The thick steel plate was the problem, a wood platform would work better.
D.I have no idea.
You go and choose a solid chemical rocket which expels gas from the engine at 3 kilometers per second. The rocket has a total mass of 2 kg with the fuel being 1 kg. The theoretical maximum speed of this rocket is:
A.The rocket cannot go faster than the speed of light.
B.The rocket can go no faster than 3 km/sec.
C.The rocket can go up to 6 km/sec.
D.The rocket is a dud.
You finally choose a very expensive liquid fuel rocket which burns hydrogen and oxygen. The rocket with no fuel has a mass of 10 kg, and 90 kg of fuel is added. The engine releases the exhaust at 5 km/sec. When you launch the rocket it travels much faster than 5 km/sec and moves into outer space. Why does this happen?
A. There is so much fuel available.
B.The rocket is so light and gets lighter as the fuel burns.
C.The total momentum of the rocket increases dramatically to counteract the backward momentum of the exhaust
D.It is magic!
After a long day you go home in your friend's really fancy sports car which has a sun-roof on the top and a spoiler (a little wing-like surface which is above the trunk and the rear wheels.) When you open the sun-roof on the top of the car your ears start to feel a bit funny. This happens because
A.The air pressure inside the car drops suddenly because the air pressure on top of the car is more than atmospheric.
B.The air pressure inside the car drops suddenly because the air pressure on top of the car is less than atmospheric.
C.The air pressure inside the car increases suddenly because the air pressure on top of the car is more than atmospheri
D.The air pressure inside the car increases suddenly because the air pressure on top of the car is less than atmospheric.
Explain your answer for the previous question. Why is the car like an airfoil? How would this affect the traction of the car's wheels? Does it help or hurt?
