A helicopter carrying Dr. Evil takes off with a constant upward acceleration of 5.0 m/s 2 . Secret agent Austin Powers jumps on just as the helicopter lifts off the ground. After the two men struggle for 10.0 s. Powers shuts off the engine and steps out of the helicopter. Assume that the helicopter is in free fall after its engine is shut off. and ignore the effects of air resistance, (a) What is the maximum height above ground reached by the helicopter’, (b) Powers deploys a jet pack strapped on his back 7.0 s after leaving the helicopter, and then he has a constant downward acceleration with magnitude 2.0 m/s 2 . How far is Powers above the ground when the helicopter crashes into the ground?
A helicopter carrying Dr. Evil takes off with a constant upward acceleration of 5.0 m/s 2 . Secret agent Austin Powers jumps on just as the helicopter lifts off the ground. After the two men struggle for 10.0 s. Powers shuts off the engine and steps out of the helicopter. Assume that the helicopter is in free fall after its engine is shut off. and ignore the effects of air resistance, (a) What is the maximum height above ground reached by the helicopter’, (b) Powers deploys a jet pack strapped on his back 7.0 s after leaving the helicopter, and then he has a constant downward acceleration with magnitude 2.0 m/s 2 . How far is Powers above the ground when the helicopter crashes into the ground?
A helicopter carrying Dr. Evil takes off with a constant upward acceleration of 5.0 m/s2. Secret agent Austin Powers jumps on just as the helicopter lifts off the ground. After the two men struggle for 10.0 s. Powers shuts off the engine and steps out of the helicopter. Assume that the helicopter is in free fall after its engine is shut off. and ignore the effects of air resistance, (a) What is the maximum height above ground reached by the helicopter’, (b) Powers deploys a jet pack strapped on his back 7.0 s after leaving the helicopter, and then he has a constant downward acceleration with magnitude 2.0 m/s2. How far is Powers above the ground when the helicopter crashes into the ground?
A model rocket is fired vertically upward from rest. Its acceleration for the first three seconds is a(t)=96t at which time the fuel is exhausted and it becomes a freely "falling" body. 19 seconds later, the rocket's parachute opens, and the (downward) velocity slows linearly to -16 ft/s in 5 s. The rocket then "floats" to the ground at that rate.
At what time does the rocket reach its maximum height? And what is that height?
A pole vaulter is momentarily motionless as he clears the bar, which is set 4.2 m above the ground. He then falls onto a thick cushion. The top of the cushion is 80 cm above the ground, and it compresses by 50 cm as the pole vaulter comes to rest. What is his acceleration as he comes to rest on the cushion?
During your summer internship for an aerospace company, you are asked to design a small research rocket. The rocket is to be launched from rest from the earth's surface and is to reach a maximum height of 980 m above the earth's surface. The rocket's engines give the rocket an upward acceleration so it moves with the acceleration of 16.0 m/s2 during the time T, that they fire. After the engines shut off, the rocket is in free fall. Ignore air resistance.
What must be the value of T in order for the rocket to reach the required altitude?
Chapter 2 Solutions
University Physics with Modern Physics Plus Mastering Physics with eText -- Access Card Package (14th Edition)
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