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Physics 17 Online
OpenStudy (anonymous):

A construction worker with a weight of 850 N stands on a roof that is sloped at 20. What is the magnitude of the normal force of the roof on the worker?

OpenStudy (xishem):

Are you given some sort of coefficient of friction for the worker and the roof?

OpenStudy (anonymous):

no, that's all I have.

OpenStudy (xishem):

|dw:1380341191452:dw|You can solve in terms of the coefficient of friction, but unless you're given that, you can't do any better, I don't think.

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