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DUS ANSWERS PSET 13.P.070 MY NOTES PRACTICE ANOTHER A ball of mass M-1.20 kg and radius...

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DUS ANSWERS PSET 13.P.070 MY NOTES PRACTICE ANOTHER A ball of mass M-1.20 kg and radius r = 4.70 cm is attached to one end of
DUS ANSWERS PSET 13.P.070 MY NOTES PRACTICE ANOTHER A ball of mass M-1.20 kg and radius r = 4.70 cm is attached to one end of a thin, cylindrical rod of length - 18.0 cm and mass m=0.880 kg. The ball and rod, initially at rest in a vertical position and free to rotate around the axis shown in the figure below, are nudged into motion M (a) What is the rotational kinetic energy of the system when the ball and rod reach a horizontal position? (b) What is the angular speed of the ball and rod when they reach a horizontal position? 72 X Your response differs from the correct answer by more than 10% Double check your calculations, rad/s (c) What is the linear speed of the center of mass of the ball when the ball and rod reach a horizontal position? ms (d) What is the ratio of the speed found in part (c) to the speed of a ball that falls freely through the same distance? Vree

Answers

use conservation COM M. of rod rotating along To find rotational ke when system moves to barizonte position, we will energy ISo Rotational energy $(1+1, )w? ( met n m Clts)) wa ( 0.8 x (910)+1:260,16+0.04%)}w? using Pont (9) result 2 3 3.45= 1 (0.(01) for free full Initial Energy - mg Ultr) 1-2x9.8( .187.043) = 2.67J Energy at horizontal position - Imu? = x 1-2x v² 4²x1

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