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# hw12 - Homework No 12 Torque CHANG 1 Find the total torque...

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Homework No. 12 Torque 2.5 m 1 m O 36.87° F 1 = 100 N F 2 = 120 N CHANG 1 Find the total torque about the pivot O produced by the two forces on the angled rod. Ans : 60 N·m CW Moment of inertia CHANG 2 A 10 Kg metal sphere with negligible size is mounted on a 5 Kg slender rod pivoted at point O as shown. Find the moment of inertia of the assembly. m, L M O θ Ans : 1 Kgm 2 CHANG 3 A 5 Kg slender rod of length 1.2 m is mounted on a disk as shown. The 8 Kg disk is pivoted at the center and has a radius of 0.5 m. Find the moment of inertia of the assembly about the pivot O . 0.2 m 0.6 O 0.6 m O R = 0.5 m L = 1.2 m Ans : 1.65 Kgm 2 Newton’s 2nd law for rotation CHANG 4 Two forces are applied as shown to the 15 Kg slender rod that is pivoted at point O . The rod rotates in the horizontal plane, so gravity has no effect on the motion. Find the angular acceleration of the rod at the position shown. Also indicate the direction of the angular acceleration.

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