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A grafuated cynlinder is filled to the 40.0-mL mark with a mineral oil. The masses of the cylinder before and after the addition of the mineral oil are 124.966g and 159.446g, respectively. In a separate experiment, a metal ball bearing of mass 20.138g is placed in the cylinder and the cylinder is again filled to the 40.0-mL mark with mineral oil. The combined mass of the ball bearing and mineral oil is 50.952g. Calculate the density and radius of the ball bearing (volume of a sphere of radius r is 4/3pi r^3).

g/cm 3 cm?

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