Q5. (a) As shown in the figure below, the rotation of the drums of both electric...

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Q5. (a) As shown in the figure below, the rotation of the drums of both electric winches make the hanging scaffold raising. If the radius and angular speed of each drum are 200 mm and 25 rev/min respectively. Determine the upward velocity v of the scaffold. [5 marks] O O 1 (b) A small ball is launched at initial velocity VA. Neglecting air resistance, it is found that as the ball leaves the nozzle at A, the radius of curvature of the path is 2x m, where x is the second last digit of your student number (e.g. 27 m if your number is 12345678A). When the ball reaches the highest position B, it passes through a smooth spherical surface of 13-m radius. Determine whether there is normal force when the ball gets in contact with the surface at B. [5 marks] 3 O B ↑ 13 m Q5. (a) As shown in the figure below, the rotation of the drums of both electric winches make the hanging scaffold raising. If the radius and angular speed of each drum are 200 mm and 25 rev/min respectively. Determine the upward velocity v of the scaffold. [5 marks] O O 1 (b) A small ball is launched at initial velocity VA. Neglecting air resistance, it is found that as the ball leaves the nozzle at A, the radius of curvature of the path is 2x m, where x is the second last digit of your student number (e.g. 27 m if your number is 12345678A). When the ball reaches the highest position B, it passes through a smooth spherical surface of 13-m radius. Determine whether there is normal force when the ball gets in contact with the surface at B. [5 marks] 3 O B ↑ 13 m