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Physics 207 WebPages - Fall 1999
Problem 2

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Problem 2 (Problem 19 in Textbook)

A wheel, starting from rest, rotates with a constant angular acceleration of 2.00 rad/s2. During a certain 3.00 s interval, it turns through 90.0 rad.

(a) How long had the wheel been turning before the start of the 3.00 s interval?

Solution:

First, we have to find the the angular velocity of the wheel at the start of the 3.00 s interval by using an equation from Table 11-1.




Then, the angular velocity, which we had just found, becomes the final velocity of the time it took for the wheel to get to the start of the 3.00 s interval. Using another equation from Table 11-1, we obtain the following setup.



(Answer)

(b) What was the angular velocity of the wheel at the start of the 3.00 s interval?

Solution:

We did this at first to find part (a).



(Answer)

 

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