COLLEGE PHYSICS
COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 7, Problem 36QAP
To determine

(a)

A graph of force versus time.

Expert Solution
Check Mark

Answer to Problem 36QAP

The graph of force versus time is as below: -

  COLLEGE PHYSICS, Chapter 7, Problem 36QAP , additional homework tip  1

Explanation of Solution

Given info:

   t( s ) 0 1 2 3 4 5 6 7 8910111213 F( N ) 20 20 10 0 10 15 18 20 252525252525

   t( s ) 1415 16 17 18 19 20 21 22 232425 F( N ) 2525 25 25 25 25 25 20 15 1050

  COLLEGE PHYSICS, Chapter 7, Problem 36QAP , additional homework tip  2

To determine

(b)

The speed of object after 25s

Expert Solution
Check Mark

Answer to Problem 36QAP

The speed of object after 25s is 200m/s

Explanation of Solution

The area under a force versus time curve is equal to the change in momentum of the object.

We break the graph into different parts two obtain the area so that we can calculate the momentum of the object.

since the object starts from rest, we have initial velocity of the object as zero that gives initial momentum of the object equals to zero.

  Area=13(3s)(20N)+12(( 22s)+( 12s))(25N)=395kg-ms=ΔpΔp=mvfmvi=mvf0vf=Δpm=( 395 kg-ms )2kg=2×102m/s

Conclusion:

The speed of object is 200m/s.

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