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Suppose a car travels 108 km at a speed of 30.0 m/s, and

College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs ISBN: 9781938168000 42

Solution for problem 4PE Chapter 7

College Physics | 1st Edition

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College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs

College Physics | 1st Edition

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Problem 4PE

Suppose a car travels 108 km at a speed of 30.0 m/s, and uses 2.0 gal of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (See Table 7.1 for the energy content of gasoline.) (a) What is the magnitude of the force exerted to keep the car moving at constant speed? (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s?

Step-by-Step Solution:

Step 1</p>

From the friction force in the engine of the car keeps the car moving at 30% of gasoline. We have to find the force that keeps the car speed at constant.

Step 2</p>

A)

Given we know that the heat content of gasoline is

We have to find the work at 30% of the gasoline usage.

To find the magnitude of the force.

Where W= work, F= magnitude of the Force.

670N is the magnitude of the force at which the car is moving.

 

 

Step 3 of 3

Chapter 7, Problem 4PE is Solved
Textbook: College Physics
Edition: 1
Author: Paul Peter Urone, Roger Hinrichs
ISBN: 9781938168000

This textbook survival guide was created for the textbook: College Physics , edition: 1. Since the solution to 4PE from 7 chapter was answered, more than 781 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 4PE 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. This full solution covers the following key subjects: speed, gasoline, Car, Force, constant. This expansive textbook survival guide covers 34 chapters, and 3125 solutions. The answer to “Suppose a car travels 108 km at a speed of 30.0 m/s, and uses 2.0 gal of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (See Table 7.1 for the energy content of gasoline.) (a) What is the magnitude of the force exerted to keep the car moving at constant speed? (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s?” is broken down into a number of easy to follow steps, and 92 words.

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