A uniform ladder of mass 30kg and length 10m has its base resting on rough horizontal ground and its top against a smooth vertical wall. The ladder rests in equilibrium, at 60 degrees to the horizontal, with a man of mass 90kg standing on the ladder at a point 7.5m from its base. Find the magnitude of the normal reaction and of the frictional force at the ground.
The answers: 1176N, 467N respectively.
I thought I worked out an answer, but I somehow got 1250N (or something along those lines) for my normal reaction, and my working isn't all that plausible, really, so- any help'll be greatly appreciated! Thanks. :)
2007-04-22
08:14:48
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2 answers
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asked by
kimiessu
2
in
Physics