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(II) If a car generates 18 hp when traveling at a steady 95 km/h, what must be the average force exerted on the car due to friction and air resistance?

$$510 \mathrm{N}$$

Physics 101 Mechanics

Chapter 6

WORK AND ENERGY

Section 10

Power

Work

Kinetic Energy

Potential Energy

Cornell University

University of Michigan - Ann Arbor

Hope College

Lectures

03:23

In physics, mechanical ene…

02:08

In physics, work is the tr…

01:35

(I) If a car generates 18 …

00:47

01:31

(II) What average force is…

01:54

02:47

01:49

A car is driven at a const…

01:25

A car uses 25 hp to drive …

01:05

(II) A 975-kg sports car a…

02:28

Resistance to the motion o…

00:57

When an automobile moves w…

01:50

What average net force is …

05:09

Automotive Power II. (a) I…

02:32

(II) A driver notices that…

05:15

A drag force on a car, wit…

01:44

A $1500-\mathrm{kg}$ car h…

01:13

(II) A 1400 -kg sports car…

03:34

05:39

(II) A sports car of mass …

04:18

(II) What is the minimum w…

00:50

everyone, This is questioned sixty from chapter six. This problem asked us to find the total resist of force on a car that's traveling forward at a steady speed. Okay, so keywords steady speed here, which means acceleration equals zero, which means the net force has to be equal zero. So the force of the engine has Teo equal the force of resistance. I'm going to note that as our Okay, so we're given a power, hear a car engine generates eighteen horse powers. Okay, so that's power. And we know that the equation for power equals force times velocity. We can rearrange that to solve for force equals p over v. And we just noted that the force is the force of the engine is equal to force of resistance. So we've were given the power of the engine in the blossom that the car is traveling at. We can just plug those numbers in and we'll have the force of resistance. So eighteen horse powers, he just learned about a conversion that seven hundred and forty six watts equals one horsepower and by that by ninety five kilometers an hour, which we can give her two meters per second because Watts is in music per second, three point six kilometers an hour from all that into a calculator, and you will get that the force of resistance, which is equal to force the engine, equals five hundred and ten news.

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