At time t=0 a grinding wheel has an angular velocity of 29.0 rad/s. It has a constant angular acceleration of 34.0 rad/s^2 until a circuit breaker trips at time t = 2.30 s. From then on, the wheel turns through an angle of 434 rad as it coasts to a stop at constant angular deceleration.(adsbygoogle = window.adsbygoogle || []).push({});

now i've gotten teh total angle the wheel turned between t=0 and the time it stopped, but i cant work out

a) what tiem the wheel stops; or

b) the angular deceleration after 2.3 s

i tried using omega = omega_0 + alpha_deceleration* t and 2*alpha_deceleration* (theta-theta_0) = omega^2-omega_0^2, using final omega = 0.

but this ended up with an end time of 315.3 seconds.... which was wrong...

help if u can plz

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# Homework Help: Spinin wheel

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