Question

wheel is rotating about an axis that is in the z-direction. The angular velocity ?z is -6.00 rad/sat t = 0, increases linearly with time, and is +4.00 rad/s at t = 12.0 s . We have taken counterclockwise rotation to be positive.

Part A

Part complete
Is the angular acceleration during this time interval positive or negative?

positive
negative

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Correct
The angular acceleration is positive, since the angular velocity increases steadily from a negative value to a positive value.

Part B

How long is the time interval during which the speed of the wheel is increasing?
Express your answer with the appropriate units.

t1 =
7.237.23ss

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Part C

How long is the time interval during which the speed of the wheel is decreasing?
Express your answer with the appropriate units.

t2 =

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Part D

What is the angular displacement of the wheel from t = 0 s to t = 12.0 s ?

? =
  rad  

Answer 1

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