physics
posted by greg .
The flywheel of a steam engine runs with a constant angular velocity of 220 rev/min. When steam is shut off, the friction of the bearings and of the air stops the wheel in 2.7 h. (a) What is the constant angular acceleration, in revolutions per minutesquared, of the wheel during the slowdown? (b) How many revolutions does the wheel make before stopping? (c) At the instant the flywheel is turning at 110 rev/min, what is the tangential component of the linear acceleration of a flywheel particle that is 47 cm from the axis of rotation? (d) What is the magnitude of the net linear acceleration of the particle in (c)?

to get angular deceleration, take the angular velocity and divide by the time. Watch units: I recommend change hrs, min to seconds, and revs to radians.
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