Part D : Application [26 marks] Solve the following problems neatly in steps with concluding statements. 38. A piece of ice (m = 800.0 g) slides down the slope of a roof inclined at 650. It starts from rest and slides 8.0 m along the roof, sliding off the edge at a height of 4.0 m above the level ground. The coefcient of kinetic friction is 0.15. [7 marks] in: : 2&2]; (3) Draw a free-body diagram of the ice as it is sliding 3.0 m u. = 0.15 along the roof. (2) (b) With what speed does it leave the roof'?(2) (c) How far away from the foot of the building does the ice land?(3) 65' 4.0 m 39. A ball of mass 5.0 kg is attached to the end of a 2.2 m long string and whirled around in a circle that describes a vertical plane. [7 marks] (a) What is the minimum speed that the ball can be moving at and still maintain a circular path? Provide a free-body diagram.(3) (b) At this speed, what is the maximum tension in the string? Provide another free-body diagram.(2) (c) If the ball is rotated in a horizontal circle at the same speed with the end of the string held above the head, what angle does the string make with the horizontal?(2) 40. An Earth satellite has an orbital period of 5.3 h. What is its orbital radius? [2 marks] (ME = 5.98 x 102'1 kg) 41. During a game of billiards, the 300 g cue ball, travelling at 2.1 m/s, glances off a stationary 280 g billiard ball so that the billiard ball moves off at 1.4 m/s at an angle of 38 from the cue ball's original path. Find the new speed of the cue ball. [3 marks] 42. Calculate the electric potential a distance 5.6 x 104 km from a point charge of 73.6 x 104 C. [3 marks]