Principles of Physics: A Calculus-Based Text

5th Edition

ISBN: 9781133104261

Author: Raymond A. Serway, John W. Jewett

Publisher: Cengage Learning

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.

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Textbook Question

Chapter 7, Problem 73P

A block of mass m₁ = 20.0 kg is connected to a block of mass m₂ = 30.0 kg by a massless string that passes over a light, frictionless pulley. The 30.0-kg block is connected to a spring that has negligible mass and a force constant of k = 250 N/m as shown in Figure P7.73. The spring is un-stretched when the system is as shown in the figure, and the incline is frictionless. The 20.0-kg block is pulled a distance h = 20.0 cm down the incline of angle θ = 40.0° (so that the 30.0-kg block is 40.0 cm above the floor) and released from rest. Find the speed of each block when the 30.0-kg block is 20.0 cm above the floor (that is, when the spring is unstretched).

Chapter 7, Problem 73P, A block of mass m1 = 20.0 kg is connected to a block of mass m2 = 30.0 kg by a massless string that

Figure P7.73

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Chapter 7 Solutions

Principles of Physics: A Calculus-Based Text

Ch. 7.1 - By what transfer mechanisms does energy enter and...Ch. 7.1 - Consider a block sliding over a horizontal surface...Ch. 7.2 - Prob. 7.3QQ Ch. 7.2 - Prob. 7.4QQ Ch. 7.4 - Prob. 7.5QQ Ch. 7 - You hold a slingshot at arms length, pull the...Ch. 7 - An athlete jumping vertically on a trampoline...Ch. 7 - Prob. 3OQ Ch. 7 - Two children stand on a platform at the top of a...Ch. 7 - Answer yes or no to each of the following...

Ch. 7 - A ball of clay falls freely to the hard floor. It...Ch. 7 - What average power is generated by a 70.0-kg...Ch. 7 - In a laboratory model of cars skidding to a stop,...Ch. 7 - At the bottom of an air track tilted at angle , a...Ch. 7 - One person drops a ball from the top of a building...Ch. 7 - Prob. 2CQ Ch. 7 - Does everything have energy? Give the reasoning...Ch. 7 - Prob. 4CQ Ch. 7 - Prob. 5CQ Ch. 7 - Prob. 6CQ Ch. 7 - A block is connected to a spring that is suspended...Ch. 7 - Consider the energy transfers and transformations...Ch. 7 - Prob. 9CQ Ch. 7 - Prob. 10CQ Ch. 7 - Prob. 1P Ch. 7 - Prob. 2P Ch. 7 - Review. A bead slides without friction around a...Ch. 7 - At 11:00 a.m, on September 7, 2001, more than one...Ch. 7 - A block of mass 0.250 kg is placed on top of a...Ch. 7 - A block of mass m = 5.00 kg is released from point...Ch. 7 - Two objects are connected by a light string...Ch. 7 - Prob. 8P Ch. 7 - Prob. 9P Ch. 7 - Prob. 10P Ch. 7 - Prob. 11P Ch. 7 - A crate of mass 10.0 kg is pulled up a rough...Ch. 7 - Prob. 13P Ch. 7 - Prob. 14P Ch. 7 - A block of mass m = 2.00 kg is attached to a...Ch. 7 - Prob. 16P Ch. 7 - A smooth circular hoop with a radius of 0.500 m is...Ch. 7 - Prob. 18P Ch. 7 - Prob. 19P Ch. 7 - As shown in Figure P7.20, a green bead of mass 25...Ch. 7 - A 5.00-kg block is set into motion up an inclined...Ch. 7 - The coefficient of friction between the block of...Ch. 7 - Prob. 23P Ch. 7 - Prob. 24P Ch. 7 - Prob. 25P Ch. 7 - Prob. 26P Ch. 7 - A child of mass m starts from rest and slides...Ch. 7 - The electric motor of a model train accelerates...Ch. 7 - Prob. 29P Ch. 7 - Prob. 30P Ch. 7 - Prob. 31P Ch. 7 - Sewage at a certain pumping station is raised...Ch. 7 - Prob. 33P Ch. 7 - Prob. 34P Ch. 7 - Prob. 35P Ch. 7 - Prob. 36P Ch. 7 - Prob. 37P Ch. 7 - Prob. 38P Ch. 7 - Prob. 39P Ch. 7 - Prob. 40P Ch. 7 - A loaded ore car has a mass of 950 kg and rolls on...Ch. 7 - Prob. 42P Ch. 7 - A certain automobile engine delivers 2.24 104 W...Ch. 7 - Prob. 44P Ch. 7 - A small block of mass m = 200 g is released from...Ch. 7 - Prob. 46P Ch. 7 - Prob. 47P Ch. 7 - Prob. 48P Ch. 7 - Prob. 49P Ch. 7 - Prob. 50P Ch. 7 - Prob. 51P Ch. 7 - Prob. 52P Ch. 7 - Jonathan is riding a bicycle and encounters a hill...Ch. 7 - Prob. 54P Ch. 7 - A horizontal spring attached to a wall has a force...Ch. 7 - Prob. 56P Ch. 7 - Prob. 57P Ch. 7 - Prob. 58P Ch. 7 - Prob. 59P Ch. 7 - Prob. 60P Ch. 7 - Prob. 61P Ch. 7 - Prob. 62P Ch. 7 - Make an order-of-magnitude estimate of your power...Ch. 7 - Prob. 64P Ch. 7 - Prob. 65P Ch. 7 - Review. As a prank, someone has balanced a pumpkin...Ch. 7 - Review. The mass of a car is 1 500 kg. The shape...Ch. 7 - A 1.00-kg object slides to the right on a surface...Ch. 7 - A childs pogo stick (Fig. P7.69) stores energy in...Ch. 7 - Prob. 70P Ch. 7 - Prob. 71P Ch. 7 - Prob. 72P Ch. 7 - A block of mass m1 = 20.0 kg is connected to a...Ch. 7 - Prob. 74P Ch. 7 - Prob. 75P Ch. 7 - Prob. 76P Ch. 7 - Prob. 77P Ch. 7 - Prob. 78P Ch. 7 - A block of mass 0.500 kg is pushed against a...Ch. 7 - A pendulum, comprising a light string of length L...Ch. 7 - Jane, whose mass is 50.0 kg, needs to swing across...Ch. 7 - A roller-coaster car shown in Figure P7.82 is...Ch. 7 - Prob. 83P

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