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03-18-2008, 06:50 PM
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| Can anyone help me with my physics homework?
A cylindrical rod 24.0 cm long with a mass of 1.20 kg and a radius of 1.50 cm has a ball of diameter of 9.50 cm and a mass of 2.00 kg attached to one end. The arrangement is originally vertical and stationary, with the ball at the top. The apparatus is free to pivot about the bottom end of the rod. (a) After it falls through 90°, what is its rotational kinetic energy? (b) What is the angular speed of the rod and ball? (c) What is the linear speed of the ball? (d) How does this compare with the speed if the ball had fallen freely through the same distance of 28.8 cm? vswing? vfall by % ?      |
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