COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 1QAP
To determine
Complete the sentence by choosing the correct word.
Expert Solution & Answer
Answer to Problem 1QAP
The static frictional force between two surfaces is sometimes less than the normal force.
Explanation of Solution
Introduction:
Friction is defined as the force that resists the sliding of one object past another. Static friction (fs) is the force that is preventing sliding. This static friction can be overcome by pushing the object with sufficient force. This is called the maximum static friction, fs,max. The value of fs,maxdepends on the normal force, n; that acts perpendicular to the two surfaces and on the properties of the surface in contact.
Here μsis the coefficient of static friction which depends on the properties of both surfaces in contact.
Typical values for the coefficient of static friction are less than one. But there are some exceptions in which the coefficient of friction has a value higher than one. Therefore, according to above equation, when μsis less than one, static friction is less than the normal force. And when μsis higher than one, static friction is larger than the normal force.
Conclusion:
The static frictional force between two surfaces is sometimes less than the normal force.
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Answers with -1.828, -1.31 or 939.3 are not correct.
Three slits, each separated from its neighbor by d = 0.06 mm, are illuminated by a coherent light source of
wavelength 550 nm. The slits are extremely narrow. A screen is located L = 2.5 m from the slits. The
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b) From the phasor diagram, calculate the intensity of light at this location.
A Jamin interferometer is a device for measuring or for comparing the indices of refraction of gases. A beam
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tube before being recombined into a single beam that is viewed through a telescope. Suppose we are given the
following,
•
Length of each tube is L = 0.4 m.
• λ= 598 nm.
Both tubes are initially evacuated, and constructive interference is observed in the center of the field of view. As
air is slowly let into one of the tubes, the central field of view changes dark and back to bright a total of 198
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Chapter 5 Solutions
COLLEGE PHYSICS
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