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# A shopper pushes a grocery cart 20.0 m at constant speed ISBN: 9781938168000 42

## Solution for problem 7PE Chapter 7

College Physics | 1st Edition

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Problem 7PE

Problem 7PE

A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 25.0º below the horizontal. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by the gravitational force? (c) What is the work done on the cart by the shopper? (d) Find the force the shopper exerts, using energy considerations. (e) What is the total work done on the cart?

Step-by-Step Solution:

Step 1 of 5</p>

The man pushes the cart in a direction below the horizontal at a constant speed against a friction force.

a) We need to find out the work done on the cart by friction.

The work done by the friction is in the opposite direction of motion.

So the work done by friction is given by The angle So F is the frictional force d is the distance,   Step 2 of 5</p>

b) We need to find out the work done on the cart by the gravitational force.

Work done by the gravitational force is perpendicular to direction of motion so the value of .

So the work done on the cart by the gravitational force is   Step 3 of 5</p>

c) We need to find out the work done by the shopper on the cart

By work energy theorem we can say the net work done on the cart is equal to the sum of work done by the shopper and the work done by the friction is equal to zero.   Step 4 of 5

Step 5 of 5

##### ISBN: 9781938168000

This textbook survival guide was created for the textbook: College Physics , edition: 1. This full solution covers the following key subjects: cart, work, done, shopper, Force. This expansive textbook survival guide covers 34 chapters, and 3125 solutions. The full step-by-step solution to problem: 7PE from chapter: 7 was answered by , our top Physics solution expert on 07/07/17, 04:39PM. College Physics was written by and is associated to the ISBN: 9781938168000. The answer to “A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 25.0º below the horizontal. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by the gravitational force? (c) What is the work done on the cart by the shopper? (d) Find the force the shopper exerts, using energy considerations. (e) What is the total work done on the cart?” is broken down into a number of easy to follow steps, and 85 words. Since the solution to 7PE from 7 chapter was answered, more than 2543 students have viewed the full step-by-step answer.

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