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October 21, 2014

Homework Help: Physics Really Need Help Please

Posted by Samantha on Friday, November 7, 2008 at 9:34pm.

At time t=0 a grinding wheel has an angular velocity of 26.0 rad/s. It has a constant angular acceleration of 25.0 rad/s^2 until a circuit breaker trips at time t = 2.50 s. From then on, the wheel turns through an angle of 440 rad as it coasts to a stop at constant angular deceleration.

Through what total angle did the wheel turn between t=0 and the time it stopped? At what time does the wheel stop? What was the wheel's angular acceleration as it slowed down?

For the total angle I got 505 rads and that's wrong. I did 26x2.5 and then added 440 but it's wrong.

For the 2nd question I did the angular velocity divided by angular acceleration and got 1.04 and added it to 2.5 but that answer is wrong, too. I have no idea how to solve this problem at all.

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