×
×

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

ISBN: 9781938168000 42

## Solution for problem 4PE Chapter 7

College Physics | 1st Edition

• Textbook Solutions
• 2901 Step-by-step solutions solved by professors and subject experts
• Get 24/7 help from StudySoup virtual teaching assistants

College Physics | 1st Edition

4 5 0 310 Reviews
26
4
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

##### 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 729 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.

#### Related chapters

Unlock Textbook Solution