3_Physics Homework - Chapter 5

# 3_Physics Homework - Chapter 5 - (b Let w be the weight of...

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(b) Let w be the weight of the astronaut. And F be the force exerted by the rocket on the astronaut. And let a be the acceleration experienced by the rocket. As the medical tests have shown that astronauts are in danger of blacking our acceleration greater than 4g, Hence Using the force equation: Therefore the force exerted on the astronaut is (c) The shortest time in which the rocket reached the speed of sound can be calculated as. Therefore, the shortest time in which the rocket reaches the speed of sound is EX 5.13 On September 8, 2004, the Genesis spacecraft crashed in the Utah desert because its parachute did not open. The 210- kg capsule hit the ground at 311 km/h and penetrated the soil to a depth of 81.0 cm. (a) Assuming it to be constant, what was its acceleration (in m/s 2 and in g’s) during the crash? (b) What force did the ground exert on the capsule during the crash? Express the force in newtons and as a mult iple of the capsule’s weight. (c) For how long did this force last? Use the kinematic information to find the acceleration of the capsule and the stopping time. Use Newton’s second law to find the force

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