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When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for the mechanical energy loss due to frictional forces exerted on the car by the air and the road. If the power developed by an engine is 175 hp, estimate the total frictional force acting on the car when it is moving at a speed of 29 m/s. One horsepower equals 746 W.


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James Samas
James SamasLv8
27 Oct 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

When an automobile moves with constant speed down a highway, mostofthe power developed by the engine is used to compensate forthemechanical energy loss due to frictional forces exerted on thecarby the air and the road. If the power developed by the engineis181 hp, estimate thetotal friction force acting on the car when itis moving at a speedof 29 m/s. One horsepowerequals 746 W.
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When an automobile moves with constant speed down a highway, mostofthe power developed by the engine is used to compensate forthemechanical energy loss due to frictional forces exerted on thecarby the air and the road. If the power developed by the engineis160 hp, estimate the total frictionforce acting on the car whenit is moving at a speed of27 m/s. One horsepower equals 746W.

A large truck breaks down out on the road and receives a push back to town by a small compact car.

Pick one of the choices A through F below which correctly describes the forces that the car exerts on the truck and the truck exerts on the car for each of the questions. You may use an answer more than once or not at all.

1. While the car, still pushing the truck, is speeding up to get up to cruising speed:

A. The force exerted by the car pushing against the truck is equal to that exerted by the truck pushing back against the car.

B. The force exerted by the car pushing against the truck is less than that exerted by the truck pushing back against the car.

C. The force exerted by the car pushing against the truck is greater than that exerted by the truck pushing back against the car.

D. The car's engine is running so it exerts a force as it pushes against the truck, but the truck's engine isn't running so it can't exert a force back against the car.

E. Neither the car nor the truck exert any force on each other. The truck is pushed forward simply because it is in the way of the car.

F. None of these descriptions is correct.

 

2. If the car and truck are moving at cruising speed, which choice(s) below are true?

A. the amount of force with which the car pushes on the truck is equal to that with which the truck pushes back on the car.

B. the amount of force with which the car pushes on the truck is smaller than that with which the truck pushes back on the car.

C. the amount of force with which the car pushes on the truck is greater than that with which the truck pushes back on the car.

D. the car's engine is running so the car pushes against the truck, but the truck's engine is not running so the truck cannot push back against the car. The truck is pushed forward simply because it is in the way of the car.

E. neither the car nor the truck exert any force on the other. The truck is pushed forward simply because it is in the way of the car. 

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