At t0 a grinding wheel has an angular velocity of 25 rads., Ask an Expert

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Q. At t=0 a grinding wheel has an angular velocity of 25.0 rad/s. It has a constant angular acceleration of 35.0 rad/s^2 until a circuit breaker trips at time t = 2.10 s. From then on, it turns through an angle 431 rad as it coasts to a stop at constant angular acceleration.

Q. A light source, S, is located 2.40 m below the surface of a swimming pool and 1.60 m from one edge of the pool. The pool is filled to the top with water.

(a) At what angle does the light reaching the edge of the pool leave the water?

(b) What is the difference between the real depth and the apparent depth of the light source?

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