College Physics
3rd Edition
ISBN: 9780134143323
Author: Knight, Randall Dewey, Jones, Brian, Field, Stuart
Publisher: Pearson,
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Chapter 6, Problem 1CQ
To determine
Whether the statement “Since the cyclist's speed is constant, her acceleration is zero." for a circular motion is correct.
Expert Solution & Answer
Answer to Problem 1CQ
The given statement is not correct because the velocity of the cyclist is changing continuously.
Explanation of Solution
Acceleration of a body is the rate at which the velocity of the object changes with time.
In a circular motion, though the speed of the cyclist is constant, the velocity vector of the cyclist is always changing, due to a change in the direction of the motion of the cyclist.
Since, the direction of motion of cyclist changes, there will be a change in the velocity of the cyclist and thereby a change in velocity induced an acceleration of the cyclist.
Therefore, the given statement is not correct because the velocity of the cyclist is changing continuously.
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Lab-Based Section
Use the following information to answer the lab based scenario.
A student performed an experiment in an attempt to determine the index of refraction of glass.
The student used a laser and a protractor to measure a variety of angles of incidence and
refraction through a semi-circular glass prism. The design of the experiment and the student's
results are shown below.
Angle of
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Angle of
Refraction (º)
20
11
30
19
40
26
50
31
60
36
70
38
2a) By hand (i.e., without using computer software), create a linear graph on graph paper
using the student's data. Note: You will have to manipulate the data in order to achieve a
linear function.
2b) Graphically determine the index of refraction of the semi-circular glass prism, rounding your
answer to the nearest hundredth.
Use the following information to answer the next two questions.
A laser is directed at a prism made of zircon (n = 1.92) at an incident angle of 35.0°, as shown in
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3a) Determine the critical angle of zircon.
35.0°
70°
55
55°
3b) Determine the angle of refraction when the laser beam leaves the prism.
Chapter 6 Solutions
College Physics
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