A1.15-kg grinding wheel 22.0 cm in diameter is spinning counterclockwise at a rate of 20.0 revolutions per second. when the power to the grinder is turned off, the grinding wheel slows with constant angular acceleration and takes 80.0 s to come to a rest. (a) what was the angular acceleration (in rad/s2) of the grinding wheel as it came to rest if we take a counterclockwise rotation as positive? (b) how many revolutions did the wheel make during the time it was coming to rest?

a) was the angular acceleration of the grinding wheel.

b)800 revolutions has made by the wheel during the time it was coming to rest

Explanation:

Initial angular velocity of grinding wheel = 20.0 rps

Final angular velocity of grinding wheel = 0.0 rps

Time taken by wheel to come to rest = t = 80.0 s

a) Angular acceleration of the wheel =

revolutions per second square

was the angular acceleration of the grinding wheel.

b) Initial angular velocity of grinding wheel = 20.0 rps

Number of revolution before coming to rest =

Number of revolution =

800 revolutions has made by the wheel during the time it was coming to rest

0.3x0.21x0.08kg=mass 1 sheet

mass 500 = 500xmass 1

volume pile = 0.3x0.2x0.048

density=mass/volume= 500xmass 1/0.3x0.2x0.048

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