A uniform scaffold pole of length 5m has brackets bolted to it as shown in the diagram below. The mass of each bracket is 1kg.(adsbygoogle = window.adsbygoogle || []).push({});

http://img502.imageshack.us/my.php?image=mechanicseb9.png

The centre of mass is 2.44m from the left hand end. What is the mass of the pole?

My attempt:

I tried using the equation

moment of whole mass at centre of mass = sum of moments of individual masses

where

x = mass of pole

whole mass = (8 + x)

moment of whole mass = 2.44

sum of moments = 17

so:

(8+x)*2.44 = 17

yet this is obviously wrong. The answer should be somewhere around 42kg.

Thx for any help :)

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# Homework Help: Mechanics Question, Moments

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