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Physics 7 questions

# Physics 7 questions - 7 nFig.1153,a6....673kg...

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7) n Fig. 11-53, a 6.13 g bullet is fired into a 0.456 kg block attached to the end of a 0.981 m nonuniform rod of mass 0.673 kg. The block-rod-bullet system then rotates in the plane of the figure, about a fixed axis at A . The rotational inertia of the rod alone about A is 0.0887 kg·m 2 . Treat the block as a particle. (a) What then is the rotational inertia of the block-rod-bullet system about point A ? (b) If the angular speed of the system about A just after impact is 2.31 rad/s, what is the bullet's speed just before impact? Fig. 11-53 Problem 60. (a) Number Units (b) Number Units 6) A man stands on a platform that is rotating (without friction) with an angular speed of 2.26 rev/s; his arms are outstretched and he holds a brick in each hand. The rotational inertia of the system consisting of the man, bricks, and platform about the central axis is 6.58 kg·m 2 . If by moving the bricks the man decreases the rotational inertia of the system to 2.94 kg·m 2 , (a) what is the resulting angular speed of the platform and (b) what is the ratio of the new kinetic energy of the system to the original kinetic energy?

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