4th Edition

ISBN: 9780135245033

Author: Knight

Publisher: PEARSON

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Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows:

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Textbook Question

Chapter 6, Problem 78EAP

An object with cross section A is shot horizontally across frictionless ice. Its initial velocity is v₀_xat t₀= 0 s. Air resistance is not negligible.

a. Show that the velocity at time t is given by the expression

v x = v 0 x 1 + C p A v 0 x t / 2 m

b. A 1.6-m-wide, 1.4-m-high, 1500 kg car with a drag coefficient of 0.35 hits a very slick patch of ice while going 20 m/s. If friction is neglected, how long will it take until the car's speed drops to 10 m/s? To 5 m/s?

c. Assess whether or not it is reasonable to neglect kinetic friction.

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Chapter 6, Problem 77EAP

Chapter 7, Problem 1CQ

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Chapter 6 Solutions

MASTERPHYS:KNIGHT'S PHYSICS ACCESS+WKB

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