# Angular velocity of rod

1. Feb 11, 2014

### nil1996

1. The problem statement, all variables and given/known data
A rod of length L and mass M is pivoted at the center C such that it can freely rotate in vertical plane.Initially the rod is at horizontal position.A blob of wax of mass M falls vertically with speed V and sticks to the rod midway between center and one end.If the rod rotates with angular speed ω what will be the angular velocity in terms of V and L?

2. Relevant equations

none

3. The attempt at a solution

Can i use energy conservation here.The kinetic energy carried by the wax blob will be transferred into rotational energy.Is this approach right?

2. Feb 11, 2014

### ehild

No, the blob sticks to the rod, it is inelastic collision.

ehild

3. Feb 11, 2014

### nil1996

So how do we calculate how much energy was useful from that collision?

4. Feb 11, 2014

### maajdl

5. Feb 11, 2014

### nil1996

i think using conservation of angular momentum will get me the answer.right?

6. Feb 11, 2014

### maajdl

Yes, but you should justify this assumption.