- #1

bjarnidk

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## Homework Statement

A thin, uniform metal bar, 2.00 m long and weighing

90.0 N, is hanging vertically from the ceiling by a frictionless

pivot. Suddenly it is struck 1.50 m below the ceiling by a small

3.00-kg ball, initially traveling horizontally at 10 m/s The ball

rebounds in the opposite direction with a speed of 6 m/s

(a) Find the angular speed of the bar just after the collision.

(b) During the collision, why is the angular momentum conserved

but not the linear momentum?

## Homework Equations

L = Iw

F = dP/dt

## The Attempt at a Solution

I tried various ways to equate the momentum of the ball to the angular momentum of the rod but it just won't work. I've been at this problem for 8 hours straight and I can barely think anymore. Please help me.

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