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The coefficient of static friction between the 2.90 kg crate and the 35.0° incline of Figure P4.41 is 0.260. What minimum force F must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline?

  • Physics -

    x: mgsinα = F(fr)
    y: N=mgcosα + F

    mgsinα = F(fr) =μN =μ(mgcosα + F),

    F =mgsinα/μ - mgcosα =
    =mg(sinα/μ – cosα)

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