Two balls of the same material, ball A and ball B, float on the surface of a pool filled with fresh water of 1000 
density. If ball A has 45% of its volume above the water, and ball B has 55% of its volume above the water, what is the ratio of radii of ball A to that of ball B?
A. .818
B. .935
C. 1.07
D. 1.22
E. None of these
F. .905
E. None of these
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A 3.50-kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the same direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
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