[填空题]
A hammer thrower accelerates:o 9vclf mb3z0ou .-a7j.1p*byv.yyahh i (5ybdgb9 s the hammer from rest within four full turns (revolutions) and releases it at a speed of 28 djs7.phygiu5a* hb.ybb9 y- y(v .oa1$m/s$ 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} $
