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The angular position of a rotating object is given as a function of time by ?...

The angular position of a rotating object is given as a function of time by ? = 4t 3 - 3t, where ? is in radians and t is in seconds. What is its angular acceleration at t = 2 s?

A

None of the choices are correct.   

B

48 rad/s2   

C

42 rad/s2   

D

24 rad/s2   

E

45 rad/s2   

science   physics   
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Homework Answers

Answer #1

The second derivative of the angualr position is the angular acceleration.

Thus,

alpha = 24t

Thus, at t = 2 s,

alpha = 48 rad/s^2 [ANSWER, OPTION B]

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