Percentage Uncertanty and youngs modulus

[pandit bandit]

Homework Statement

hi there! I am new to this forum and was just wondering if anyone could help with this question on percentage uncertainty. I am supposed to find the percentage uncertainty in d^3

the info given is
mass attached to the end of a strip= 0.1 (+-0.001)kg
the width of the strip = 12.6 (+- 0.1)mm
the thickness of the strip= 0.66(+- 0.01)mm

Homework Equations

I am also given the equation for youngs modulus

E= 16pi^2 K^2 M/bd^3

The Attempt at a Solution

I worked out the percentage uncertainty of the thickness of the strip which was approx. 1.52% but am for completely lost

Thank You!

 

[Mapes]

Looks like a http://en.wikipedia.org/wiki/Propagation_of_uncertainty#Partial_derivatives" problem to me.

 

[pandit bandit]

so would i just simply multiply the percentage uncertainty by 3 as its d^3?

 

[Mapes]

Sure, I'd buy that.