- #1
Firepanda
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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.
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 :)
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 :)