# Help needed with rearranging an equation

by Hussman
Tags: equation, moment of inertia, rearranging
 P: 9 Im having trouble rearranging an equation to find a value for I. [The given equation is mgh = 1/2*Iw^2 + 1/2*mv^2 + Tf * theta My attempt was a bit of a stab in the dark as i am useless with rearranging equations. I = mgh/w^2 + 1/2*mv^2 + Tf * theta Many thanks
 P: 910 To make I subject of the equation is like peeling an onion. First step: Transfer those two terms on the RHS not involving I to the LHS.
 P: 9 ok so you end up with mgh - 1/2*mv^2 - Tf*theta = 1/2*Iw^2 Would the lhs be divided by 1/2 w^2? Thanks
P: 910

## Help needed with rearranging an equation

Yes we 'peel the next layer of the onion' by dividing BOTH sides by $\frac{\omega^{2}}{2}$ to isolate the I by itself on the RHS.
 P: 9 Nice one cheers

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