19 Question 9 (12 marks) A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 28.0 m- s'l. Assume a uniform rate of increase in angular velocity and a horizontal circular path of radius 1.2 m. 3) Calculate the angular acceleration of the hammer. h) Find the time required to accelerate the hammer from rest to its nal velocity. c) Calculate the magnitudes of the centripetal and tangential components of the net force exerted on the hammer by the athlete just before release d) Draw the graphs (9 vs 2, a) vs !,a vs I) associated with the motion of the hammer from rest until the hammer is released. a) Angular acceleration: 3 b) Time: 2 c) Magnitude of centripetal force: Magnitude of tangential force: 4 2t] d) a) (rad- s'l) 9(rad) ! (S) a (rad' 5'2) t(s) t (s)