Find the angular acceleration when the angular velocity is zero?
A
−630rads−2
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B
−40rads−2
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C
−670rads−2
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D
none
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Solution
The correct option is A−670rads−2 We take the second derivative of the given angular displacement θ to get the acceleration.. a=d2θdt2 =−40−900t We have calculated in the earlier problem that the velocity becomes zero at t=0.7s. Thus a=−40−900(.7) =−670rads−2