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college physics

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A 32 kg box sitting on a ramp has a coefficent of 0.21. If the ramp is raised, at what angle will the box begin slipping?

  • college physics -

    coefficent of friction?

    force downward=Fn*mu=mgCosTheta*mu
    force down the ramp= mg*sinTheta

    set these two forces equal
    mgCosTheta*mu=mgSinTheta
    I think you get

    tan Theta=mu
    check that.

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