# I hate Math

• Apr 30th 2012, 02:51 AM
SENOGLES100
I hate Math
Hi there I'm an engineering graduate
• Apr 30th 2012, 03:08 AM
Prove It
Re: I hate Math
Quote:

Originally Posted by SENOGLES100
Hi there I'm an engineering graduate

Hi, do you mind if I ask, if you hate maths, and if you have graduated, why are you here?
• Apr 30th 2012, 03:18 AM
SENOGLES100
Re: I hate Math
Hi there, I am here cause one of my collegues asked me a question that I didnt know (didnt tell het that). She titled her e-mail as "I hate Maths" hence why. Perhaps you could help.

A hemispherical dome of radius r metres has a volume of V given by V=2/3 pie r cubed

If the error in measuring V is dV and the corresponding error in calculating r is dr, obtain a formula giving a good approximation for dr I'm terms of V and dV.

Calculate the value of r and the maximum error in dr when the volume 525 m cubed with a maximum error of 0.5m cubed. To 4 Sig fig
• May 1st 2012, 01:35 AM
emakarov
Re: I hate Math
We have $dV = 2\pi r^2dr$, so dr can be expressed through dV and r. Further, r can be expressed through V. If I am not mistaken, $dr=\frac{dV}{(2\pi)^{1/3}(3V)^{2/3}}$.
• May 1st 2012, 02:25 AM
SplashDamage
Re: I hate Math