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Q. A friend whose mass is only 71 kg, slides down the same distance, but the pole force is only 83 % of the force on his buddy. How long did the second person's slide take?

Q. A uniform, 8.60 , spherical shell 47.0 in diameter has four small 2.50 masses attached to its outer surface and equally spaced around it. This combination is spinning about an axis running through the centre of the sphere and two of the small masses .What friction torque is needed to reduce its angular speed from 80.0 to 51 in 27?

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