# Chopping Down A Tree

**Classical Mechanics**Level 3

A perfectly symmetrical tree has a trunk in the shape of a cylinder with diameter \(0.2~\mbox{m}\). Since the tree is symmetrical the center of mass is at some distance \(L\) above the ground along the axis of the cylinder. A rotten lumberjack with no concept that he's cutting down the most amazing tree ever grown uses a chain saw to cut the tree down. He saws horizontally right at the base of the tree (ground level).

What is the minimum value of \(L\) **in meters** such that the tree begins to topple over as soon once the chain saw reaches the position in the picture?

**Details and assumptions**

- The chain saw blade is \(8~\mbox{cm}\) wide and \(0.5~\mbox{cm}\) high.
- Treat the tree as a rigid body.

**Your answer seems reasonable.**Find out if you're right!

**That seems reasonable.**Find out if you're right!

Already have an account? Log in here.