# physics

A rotating wheel requires 7.00 s to rotate 28.0 revolutions. Its angular velocity at the end of the 7.00-s interval is 97.0 rad/s. What is the constant angular acceleration (in rad/s) of the wheel?

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1. wf=wi+alpha*t
97=wi+7*a

28*2PI=wi*7+1/2 a *49

so you have two equations, two unknowns. Since you are intersted in a, solve for wi in the first equation, put it in the second, and solve for a.

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bobpursley

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