An athlete whirls a 7.00 kg hammer 1.8 m from the axis of rotation in a horizontal circle, as shown in Figure 6-14 below. If the hammer makes one revolution in 1.0 sec, what is the centripetal acceleration of the hammer? (Range: 60 - 90 m/s 2 )

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to: