#1
I'm stuck on this question in my math homework and I knw the Pit likes a challenge, so can anyone work this out or at least tell me how to work this question out? I just can't get my head round it:

For a light metal beam of length L m, carrying a load at it's midpoint, the sag S cm varies as the cube of the length.

Given that S = 1.8 when L = 5, calculate the sag when the length L is 8.4 metres.

Cheers. I don't think it's worded badly, but I don't understand what it's asking.
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#3
there is a math thread you know?
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