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Chapter 1: Q9 DQ (page 356)

9. An object consists of a ball of weight W glued to the end of a uniform bar also of weight W. If you release it from rest, with the bar horizontal, what will its behavior be as it falls if air resistance is negligible? Will it (a) remain horizontal; (b) rotate about its center of gravity; (c) rotate about the ball; or (d) rotate so that the ball swings downward? Explain your reasoning.

Short Answer

Expert verified

The ball and the rod remains horizontal.

Step by step solution

01

Center of gravity

The center of gravity is the point on a body where the total weight of the body is concentrated.

02

Reason for remain horizontal

Every rod is weightless implies there is no net torque in the system connected to the rod.

So, the rod and the ball glued remains horizontal.

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