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# A planet is moving at constant speed in a circular orbit

ISBN: 9780321675460 31

## Solution for problem 11DQ Chapter 13

University Physics | 13th Edition

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University Physics | 13th Edition

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Problem 11DQ

A planet is moving at constant speed in a circular orbit around a star. In one complete orbit, what is the net amount of work done on the planet by the star’s gravitational force: positive, negative, or zero? What if the planet’s orbit is an ellipse, so that the speed is not constant? Explain your answers.

Step-by-Step Solution:

Solution 11DQ Introduction We have to discuss about the total work done by the gravitational force of a star on the planet orbiting it. Step 1 Since the planet is moving with constant speed, the orbit is circular. Now the gravitational force will act directly from planet to the star, that is the gravitational force will always act radially inwards. Hence the direction of motion of the planet and the direction of the force are perpendicular to each other and hence the work done by the gravity will be zero.

Step 2 of 2

##### ISBN: 9780321675460

Since the solution to 11DQ from 13 chapter was answered, more than 287 students have viewed the full step-by-step answer. The answer to “A planet is moving at constant speed in a circular orbit around a star. In one complete orbit, what is the net amount of work done on the planet by the star’s gravitational force: positive, negative, or zero? What if the planet’s orbit is an ellipse, so that the speed is not constant? Explain your answers.” is broken down into a number of easy to follow steps, and 56 words. This full solution covers the following key subjects: orbit, planet, speed, star, constant. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. The full step-by-step solution to problem: 11DQ from chapter: 13 was answered by , our top Physics solution expert on 05/06/17, 06:07PM. University Physics was written by and is associated to the ISBN: 9780321675460. This textbook survival guide was created for the textbook: University Physics, edition: 13.

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