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× ISBN: 9780130606204 3

## Solution for problem 65PE Chapter 7

Physics: Principles with Applications | 6th Edition

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Problem 65PE

Results A car advertisement claims that its 900-kg car accelerated from rest to 30.0 m/s and drove 100 km, gaining 3.00 km in altitude, on 1.0 gal of gasoline. The average force of friction including air resistance was 700 N. Assume all values are known to three significant figures. (a) Calculate the car’s efficiency. (b) What is unreasonable about the result? (c) Which premise is unreasonable, or which premises are inconsistent?

Step-by-Step Solution:

Step-by-step solution Step 1 of 5 (a) Calculate the car’s efficiency from relation, Here, is the output work and is the input work. Step 2 of 5 The output work is given as, Here, is the mass of the car, is the velocity of the car, is the frictional force acting on the car, is the distance covered by the car, is the acceleration due to gravity and is the height covered by the car. Step 3 of 5 Substitute for , for , for , for , for , for and for in equation, Solve, Hence, the value of the car’s efficiency is .

Step 4 of 5

Step 5 of 5

##### ISBN: 9780130606204

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