Register to reply

Help needed with rearranging an equation

Share this thread:
Nov20-11, 11:51 AM
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
Phys.Org News Partner Science news on
Scientists develop 'electronic nose' for rapid detection of C. diff infection
Why plants in the office make us more productive
Tesla Motors dealing as states play factory poker
Nov20-11, 12:09 PM
P: 950
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.
Nov20-11, 01:09 PM
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?


Nov20-11, 02:04 PM
P: 950
Help needed with rearranging an equation

Yes we 'peel the next layer of the onion' by dividing BOTH sides by [itex]\frac{\omega^{2}}{2}[/itex] to isolate the I by itself on the RHS.
Nov23-11, 01:01 PM
P: 9
Nice one cheers

Register to reply

Related Discussions
Help rearranging equation Calculus 1
Rearranging an equation Introductory Physics Homework 7
Assistance Needed For Rearranging Equations General Physics 1
Rearranging equation General Math 3
Formula Rearranging ~Help Needed~ *Easy* General Math 2