The image shows a pendulum in simple harmonic motion. The pendulum starts at A and swings to E. An illustration of a pendulum at 5 different positions. The central position, the equilibrium position is labeled C. The two positions on the left are labeled a and B respectively. The two positions on the right are labeled D and E respectively. All positions are equally spaced. Which labels are correct? Check all that apply. E: Net force is zero. D: Velocity is decreasing. Acceleration is increasing. A: Velocity is zero. C: Acceleration is maximum. B: Velocity is decreasing. Net force is decreasing. E: Velocity is maximum.

Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r