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EXERCISE 21
EXERCISE 21 An astronaut accidentally lets go of the Space Shuttle while on a spacewalk. She begins to travel away from the shuttle at 3.5 m/sec. Thinking quickly, she fires the thruster rocket in her space suit until she is moving 0.5 m/sec back toward the shuttle, and reattaches to the shuttle soon after. (a) If the combination of space suit plus astronaut has a mass of 95 kg, what was the total change in momentum that thruster rocket produced? (b) If the rocket provides a force of 45 newtons, how long did the rocket fire? (c) What was the astronaut's acceleration during that time? |