(chatquestion)...7. A small metal ball is being pulled gradually on a fixed frictionless hemisphere as shown in the figure. Radii of the ball and that of the pulley are much smaller than that of the hemisphere. As the ball slides from the bottom to a position close to the top of the hemisphere, how do. the magnitudes of pulling force F and contact force R between the ball and the hemisphere change? (a) F increases and R decreases. (b) F decreases and R increases. (c) F decreases and R remains unchanged. (d) F remains unchanged and R decreases.

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