# Homework Help: Trebuchet , rotational K.E.

1. Nov 27, 2007

### KvnBushi

1. The problem statement, all variables and given/known data
A war-wolf, or trebuchet, is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling pumpkins and pianos. A simple trebuchet is shown in Figure P8.77. Model it as a stiff rod of negligible mass 3.00 m long and joining particles of mass 60.0 kg and 0.120 kg at its ends. It can turn on a frictionless horizontal axle perpendicular to the rod and 14.0 cm from the particle of larger mass. The rod is released from rest in a horizontal orientation. Find the maximum speed that the object of smaller mass attains.
Pic: www.s-consolidated.com/graphics/trebuchet.jpg[/URL]

[b]2. Relevant equations[/b]
$$K = \frac{1}{2} I_{cm} w^2 + \frac{1}{2} M v_{cm}^2$$

[b]3. The attempt at a solution[/b]

I am not even sure how to model it yet. I will attempt some things and write them as I go.

Last edited by a moderator: Apr 23, 2017