(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A chimney (length L = 82.6 m, mass M = 2280 kg) cracks at the base, and topples. Assume:

- the chimney behaves like a thin rod, and it does not break apart as it falls

- only gravity (no friction) acts on the chimney as if falls

- the bottom of the chimney tilts but does not move left or right

Find vtop, the linear speed of a point on the top of the chimney just as it hits the ground.

2. Relevant equations

→Conservation of energy

→KE = ½Iω²?

→v = ωr?

3. The attempt at a solution

What if I tried this method?

mgL = ½ * 1/3 * mL² * ω²

ω = √(6g/L)

Then...

v = √(6g/L) * L

But the whole answer is wrong.

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# Homework Help: Rotational problem another time (this time not the center of mass)!

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