A wheel is rotating about an axis that is in the z -direction. The angular veloc

Question

A wheel is rotating about an axis that is in thez-direction. The angular velocity z is -6.00 rad/sat t = 0, increases linearly with time, and is+4.00 rad/s at t = 14.0 s . We have taken counterclockwise rotation to be positive.

Part A.) Is the angular acceleration during this time interval positive or negative? Answer is postive

Part B.) During what time interval is the speed of the wheel increasing? Answer is t1=8.40s

Part C.) During what time interval is the speed of the wheel decreasing?

I got 14s but that is not the answer

Part D.) What is the angular displacement of the wheel at t = 14.0 s ? rad

Explanation / Answer

b) t=14*4/10=5.6 sec
   interval is t=8.4 sec to t=14 sec
c) t=0 to t=8.4 sec
d) -14 rad

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