A 50.0kg parachutist falls at a speed of 47m/s when the parachute opens. the parachuists speeds upon landing is 5m/s. How much work is done by the air to reduce the parachuitist speed.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .