### How long does it take for the grinding wheel to stop

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Q. A stunt pilot performs a circular dive of radius 715m. At the bottom of the dive the pilot has a speed of 265 m/s which at that instant is increasing at a rate of 15 m/s2(along the direction of vector B) What total acceleration does the pilot have at point B?

Q. An electric motor rotating a workshop grinding wheel at a rate of 113 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.20 rad/s2.

How long does it take for the grinding wheel to stop?

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