[填空题]
A hammer thrower accelerates the hammer from rest wit v te8,c+)qb tzj37-u:kpve hlhin four fj+-ep-1 yqc/nldox*e ull turns (revolutions) and release+e*-ld xjqop y cn1e/-s 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} $
