5th Edition

ISBN: 9780134296074

Author: GIANCOLI

Publisher: VST

Concept explainers

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 92GP

Assume a cyclist of weight mg can exert a force on the pedals equal to 0.90 mg on the average. If the pedals rotate in a circle of radius 18 cm, the wheels have a radius of 34 cm, and the front and hack sprockets on which the chain runs have 42 and 19 teeth respectively (Fig. 7–31), determine the maximum steepness of hill the cyclist can climb at constant speed. Assume the mass of the bike is 12 kg and that of the rider is 65 kg. Ignore friction. Assume the cyclist’s average force is always: (a) downward; (b) tangential to pedal motion.

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Chapter 7, Problem 91GP

Chapter 7, Problem 93GP

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(II) At an accident scene on a level road, investigators measure a car's skid mark to be 98 m long. It was a rainy day and the coefficient of friction was estimated to be 0.38. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. (Why does the car's mass not matter?)

. (II) At an accident scene on a level road, investigatorsmeasure a car’s skid mark to be 78 m long. It was a rainyday and the coefficient of friction was estimated to be 0.30.Use these data to determine the speed of the car when thedriver slammed on (and locked) the brakes. (Why does thecar’s mass not matter?)

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Chapter 7 Solutions

EBK PHYSICS FOR SCIENTISTS & ENGINEERS

Ch. 7.1 - A box is dragged a distance d across a floor by a...Ch. 7.1 - Return to the Chapter-Opening Question, page 163,...Ch. 7.4 - (a) Make a guess: will the work needed to...Ch. 7.4 - Can kinetic energy ever be negative?Ch. 7.4 - Prob. 1EE Ch. 7 - In what ways is the word work as used in everyday...Ch. 7 - A woman swimming upstream is not moving with...Ch. 7 - Can a centripetal force ever do work on an object?...Ch. 7 - Why is it tiring to push hard against a solid wall...Ch. 7 - Does the scalar product of two vectors depend on...

Ch. 7 - Can a dot product ever he negative? If yes, under...Ch. 7 - Prob. 7Q Ch. 7 - Does the dot product of two vectors have direction...Ch. 7 - Can the normal force on an object ever do work?...Ch. 7 - You have two springs that are identical except...Ch. 7 - Prob. 11Q Ch. 7 - In Example 710, it was stated that the block...Ch. 7 - Does the net work done on a particle depend on the...Ch. 7 - Prob. 2MCQ Ch. 7 - Prob. 3MCQ Ch. 7 - Prob. 5MCQ Ch. 7 - Prob. 7MCQ Ch. 7 - Prob. 8MCQ Ch. 7 - Prob. 9MCQ Ch. 7 - Prob. 10MCQ Ch. 7 - Prob. 12MCQ Ch. 7 - Prob. 13MCQ Ch. 7 - Prob. 14MCQ Ch. 7 - (I) How much work is done by the gravitational...Ch. 7 - (I) How high will a 1.85-kg rock go if thrown...Ch. 7 - (I) A 75.0-kg firefighter climbs a flight of...Ch. 7 - (I) A hammerhead with a mass of 2.0 kg is allowed...Ch. 7 - Prob. 5P Ch. 7 - Prob. 6P Ch. 7 - Prob. 7P Ch. 7 - Prob. 8P Ch. 7 - (II) Estimate the work you do to mow a lawn 10 m...Ch. 7 - Prob. 10P Ch. 7 - (II) A lever such as that shown in Fig. 720 can be...Ch. 7 - Prob. 12P Ch. 7 - Prob. 13P Ch. 7 - Prob. 14P Ch. 7 - Prob. 15P Ch. 7 - Prob. 16P Ch. 7 - Prob. 17P Ch. 7 - Prob. 18P Ch. 7 - (I) For any vector V=Vxi+Vyj+Vzk show that...Ch. 7 - Prob. 20P Ch. 7 - Prob. 21P Ch. 7 - Prob. 22P Ch. 7 - Prob. 23P Ch. 7 - (II) A constant force F=(2.0i+4.0j)N acts on an...Ch. 7 - Prob. 25P Ch. 7 - Prob. 26P Ch. 7 - (II) Show that if two nonparallel vectors have the...Ch. 7 - Prob. 28P Ch. 7 - Prob. 29P Ch. 7 - Prob. 30P Ch. 7 - Prob. 31P Ch. 7 - Prob. 32P Ch. 7 - Prob. 33P Ch. 7 - Prob. 34P Ch. 7 - Prob. 35P Ch. 7 - Prob. 36P Ch. 7 - Prob. 37P Ch. 7 - (II) If the hill in Example 72 (Fig. 74) was not...Ch. 7 - (II) The net force exerted on a particle acts in...Ch. 7 - Prob. 40P Ch. 7 - (II) The force on a particle, acting along the x...Ch. 7 - Prob. 42P Ch. 7 - Prob. 43P Ch. 7 - (II) At the top of a pole vault, and athlete...Ch. 7 - Prob. 45P Ch. 7 - Prob. 46P Ch. 7 - (II) If it requires 5.0 J of work to stretch a...Ch. 7 - (II) An object, moving along the circumference of...Ch. 7 - Prob. 49P Ch. 7 - Prob. 50P Ch. 7 - Prob. 51P Ch. 7 - Prob. 52P Ch. 7 - (III) A 3.0-m-long steel chain is stretched out...Ch. 7 - (I) At room temperature, an oxygen molecule, with...Ch. 7 - (I) (a) If the kinetic energy of a particle is...Ch. 7 - Prob. 56P Ch. 7 - Prob. 57P Ch. 7 - Prob. 58P Ch. 7 - Prob. 59P Ch. 7 - (II) An 85-g arrow is fired from a bow whose...Ch. 7 - (II) If the speed of a car is increased by 50%, by...Ch. 7 - Prob. 62P Ch. 7 - Prob. 63P Ch. 7 - Prob. 64P Ch. 7 - Prob. 65P Ch. 7 - (II) (a) How much work is done by the horizontal...Ch. 7 - Prob. 67P Ch. 7 - Prob. 68P Ch. 7 - (II) A train is moving along a track with constant...Ch. 7 - Prob. 70P Ch. 7 - Prob. 71P Ch. 7 - Prob. 72P Ch. 7 - Prob. 73P Ch. 7 - Prob. 74GP Ch. 7 - Prob. 75GP Ch. 7 - Prob. 76GP Ch. 7 - Prob. 77GP Ch. 7 - Prob. 78GP Ch. 7 - A varying force is given by F = Aekx, where x is...Ch. 7 - Prob. 80GP Ch. 7 - A force F=(10.0i+9.0j+12.0k)kNacts on a small...Ch. 7 - Prob. 82GP Ch. 7 - Prob. 83GP Ch. 7 - Prob. 84GP Ch. 7 - (III) We usually neglect the mass of a spring if...Ch. 7 - Prob. 86GP Ch. 7 - Prob. 87GP Ch. 7 - Prob. 88GP Ch. 7 - Prob. 89GP Ch. 7 - Prob. 90GP Ch. 7 - Prob. 91GP Ch. 7 - Assume a cyclist of weight mg can exert a force on...Ch. 7 - A car passenger buckles himself in with a seat...Ch. 7 - A simple pendulum consists of a small object of...Ch. 7 - Prob. 95GP Ch. 7 - A small mass m hangs at rest from a vertical rope...Ch. 7 - Prob. 97GP Ch. 7 - Prob. 98GP Ch. 7 - Stretchable ropes ate used to safely arrest the...Ch. 7 - Prob. 100GP

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