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# A 125-kg (including all the contents) rocket has an engine ISBN: 9780321675460 31

## Solution for problem 12E Chapter 5

University Physics | 13th Edition

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Problem 12E

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.)

Step-by-Step Solution:
Step 1 of 3

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 of the power supply when the rocket was at rest was 15.5 N. The mass of the power supply is, mass = 15.5 / 9.8 = 1.58 kg The normal reaction on the power supply by the floor of the rocket is, N = mg + ma = 15.5 N + 1.58 × 13.76 = 15.5 + 21.76 = 37.26. So, the floor pushes with 37.26 N force to the power supply. The free body diagram for the power supply is given below.

Step 2 of 3

Step 3 of 3

##### ISBN: 9780321675460

The answer to “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.)” is broken down into a number of easy to follow steps, and 70 words. Since the solution to 12E from 5 chapter was answered, more than 872 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: University Physics, edition: 13. The full step-by-step solution to problem: 12E from chapter: 5 was answered by , our top Physics solution expert on 05/06/17, 06:07PM. This full solution covers the following key subjects: power, supply, rocket, floor, hint. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. University Physics was written by and is associated to the ISBN: 9780321675460.

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