SAT Subject Physics Practice Question 44: Answer and Explanation

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Question: 44

1. An object of mass 0.5 kg, moving in a circular path of radius 0.25 m, experiences a centripetal acceleration of constant magnitude 9 m/s2. What is the object’s angular speed?

A. 2.3 rad/s
B. 4.5 rad/s
C. 6 rad/s
D. 12 rad/s
E. Cannot be determined from the information given

Correct Answer: C

Explanation:

By combining the equation for centripetal acceleration, ac = v2/r, with v = rω, we find

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