2.       This question is about forces.

          A solid iron ball of mass 770 kg is used on a building site. The ball is suspended by a rope from a crane. The distance from the point of suspension to the centre of mass of the ball is 12 m.

(a)     Calculate the tension in the rope when the ball hangs vertical and stationary.

…………………

(b)     The ball is pulled back from the vertical and then released. It falls through a vertical height of 1.6 m and strikes a wall.

(i)      Calculate the speed of the ball just before impact.

 

(ii)     Calculate the tension in the rope just before impact.

………………………………………………………………………………………………………..

 

(c)     The ball is brought to rest in 0.15 s. The sketch graph below shows how the force the ball exerts on the wall varies with time.

(i)      State what quantity is represented by the area under the graph.

……………………………………………………………………………………………………………

(1)

(ii)     Determine the maximum force Fmax exerted by the ball on the wall.

…………………………………………………………………………………………………………… ……………………………………………………………………………………………………………