- #1

ledphones

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## Homework Statement

Two 2.1 kg balls are attached to the ends of a thin rod of negligible mass, 63 cm in length. The rod is free to rotate in a vertical plane about a horizontal axis through its center. With the rod initially horizontal as shown, a 50 gm wad of wet putty drops onto one of the balls with a speed of 3.9 m/sec and sticks to it. a) What is the angular speed of the system just after the putty wad hits?

ω = rad/sec *

.146 OK

b) What is the ratio of the kinetic energy of the entire system just after the collision to just before the collision?

KEafter/KEbefore = *

.01175 OK

c) Through what angle will the system rotate until it momentarily stops?

ΔΘ = rad

## Homework Equations

## The Attempt at a Solution

Im not sure how to approach part c since I don't know the acceleration or the time it takes to stop.