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Get Full Access to University Physics - 13 Edition - Chapter 8 - Problem 66p
Get Full Access to University Physics - 13 Edition - Chapter 8 - Problem 66p

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# A young girl with mass 40.0 kg is sliding on a horizontal, ISBN: 9780321675460 31

## Solution for problem 66P Chapter 8

University Physics | 13th Edition

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Problem 66P

A young girl with mass 40.0 kg is sliding on a horizontal, frictionless surface with an initial momentum that is due east and that has magnitude 90.0 kg · m/s. Starting at ?t? = 0, a net force with magnitude ?F? = (8.20 N/s)?t? and direction due west is applied to the girl. (a) At what value of? ? does the girl have a westward momentum of magnitude 60.0 kg · m/s? (b) How much work has been done on the girl by the force in the time interval from ?t? = 0 to the time calculated in part (a)? (c) What is the magnitude of the acceleration of the girl at the time calculated in part (a)?

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Making Sense of the Universe: Chapter 3 4.1 Describing Motion: Examples from Daily Life How do we describe motion  Terms used to describe motion: velocity, acceleration, and momentum.  Speed – how far something will go in a certain amount of time.  Velocity – the speed and direction of something.  Acceleration – when there is a change in speed or direction.  Acceleration is not just an increased speed, in science you are accelerating when you are slowing down and speeding up. Also, when you turn around means a change in direction, which therefore means a change in velocity.  Galileo pointed out that gravity accelerates all objects by the same amount of time.  Air resistance would change the rate of a feather and a rock fall

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##### ISBN: 9780321675460

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