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The beam of light from a laser on a rotating turntable

Conceptual Physics | 12th Edition | ISBN: 9780321909107 | Authors: Paul G. Hewitt ISBN: 9780321909107 29

Solution for problem 11E Chapter 35

Conceptual Physics | 12th Edition

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Conceptual Physics | 12th Edition | ISBN: 9780321909107 | Authors: Paul G. Hewitt

Conceptual Physics | 12th Edition

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Problem 11E

The beam of light from a laser on a rotating turntable casts into space. At some distance, the beam moves across space faster than ?c?. Why does this not contradict relativity?

Step-by-Step Solution:

Solution 11E Step 1: In this problem, they have provided that, the beam of light from a laser light on rotating turn table is projected into space. So, at some instant, the beam will be appeared to move faster than the speed of light. We should not get confused about the speed of laser light with this. They have clearly asked about the condition of light beam travelling across the space which gets projected from the laser on the turntable. So, the circular motion of the table in fact creates the condition of violating principle of relativity. So, in the region with dotted lines, the speed will exceed c. But it does not contradicts relativity...

Step 2 of 3

Chapter 35, Problem 11E is Solved
Step 3 of 3

Textbook: Conceptual Physics
Edition: 12
Author: Paul G. Hewitt
ISBN: 9780321909107

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The beam of light from a laser on a rotating turntable

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