2) Suppose a car travels 108 km at a speed of 40.0 m/s, and uses 1.80 gallons of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is 1.30 ✕ 108 J per gallon.)(a)What is the force (in N) exerted to keep the car moving at constant speed?_____ N (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?_____ gallons

Distance travelled by car = 108 km Speed of car = 40 m/s Fuel used by car = 1.8 gallons of gasoline…

Answered: Suppose a car travels 108 km at a speed…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter7: Conservation Of Energy

Section: Chapter Questions

Problem 33P

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2) Suppose a car travels 108 km at a speed of 40.0 m/s, and uses 1.80 gallons of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is 1.30 ✕ 10⁸ J per gallon.)

(a)What is the force (in N) exerted to keep the car moving at constant speed?

_____ N

(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?

_____ gallons

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