SAT Subject Physics Practice Question 597: Answer and Explanation

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Question: 597

8. A laboratory centrifuge starts from rest and reaches a rotational speed of 8,000 radians/ sec in a time of 25 seconds. What is the angular acceleration of the centrifuge?

A. 160 radians/sec2
B. 320 radians/sec2
C. 640 radians/sec2
D. 10,000 radians/sec2
E. 20,000 radians/sec2

Correct Answer: B

Explanation:

The correct answer is (B). The angular acceleration is found by dividing the change in angular velocity by the change in time:

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