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Physics / University Physics 13 / Chapter 5 / Problem 12E

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

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A 125-kg (including all the contents) rocket has an engine

Chapter 8, Problem 12E

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QUESTION:

A 125-kg (including all the contents) rocket has an engine that produces a constant vertical force (the ?thrust?) of 1720 N. Inside this rocket, a 15.5-N electrical power supply rests on the floor. (a) Find the acceleration of the rocket. (b) When it has reached an altitude of 120 m, how hard does the floor push on the power supply? (?Hint:? Start with a free-body diagram for the power supply.)

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QUESTION:

A 125-kg (including all the contents) rocket has an engine that produces a constant vertical force (the ?thrust?) of 1720 N. Inside this rocket, a 15.5-N electrical power supply rests on the floor. (a) Find the acceleration of the rocket. (b) When it has reached an altitude of 120 m, how hard does the floor push on the power supply? (?Hint:? Start with a free-body diagram for the power supply.)

ANSWER:

Solution 12E a) The mass of the rocket is 125 kg. The thrust produced by the engine is 1720 N. So, the acceleration of the rocket is, 2 a = 1720 N / 125 kg = 13.76 m/s . b) The weight o

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