[填空题]
A hammer thrower accbxg 69.zu c/r+fcrslpa n 2v: s.5-kvve*9 6 w.84:eyudg qj ;l8vpyfl8hvjsfrlerates the hammer from rest within four full turns (revolutionsgy eq;w 9l68 u4fj .p*hl8srjyvvdf :8) and releases it at a speed of 28 $m/s$ Assuming a uniform rate of increase in angular velocity and a horizontal circular path of radius 1.20 m, calculate
(a) the angular acceleration, $rad/s^2$
(b) the (linear) tangential acceleration, $m/s^2$
(c) the centripetal acceleration just before release, $m/s^2$
(d) the net force being exerted on the hammer by the athlete just before release, N
(e) the angle of this force with respect to the radius of the circular motion. $^{\circ} $
