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physics please please please please please

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a block of mass 2.50 kg rests on a ramp. if the coefficient of static friction between the block and ramp is 0.350, what maximum angle can the ramp make with the horizontal before the block starts to slip down?

  • physics please please please please please - ,

    F = 2.50 * 9.8 = 24.5N @ A deg.

    Fp = 24.5*sinA = Force parallel with plane.

    Fv = 24.5*cosA = Force perpendicular to
    plane.

    uFv = 0.35Fv = Force of friction.

    Fp - 0.35Fv = ma,
    a = 0(block at rest),
    Fp -0.35Fv = 0,
    Fp = 0.35Fv,
    24.5*sinA = 0.35*24.5*cosA,
    Divide both sides by 24.5:
    sinA = 0.35*cosA
    Divide both sides by cosA:
    sinA / cosA = 0.35,
    sinA / cosA = TanA,
    TanA = 0.35,
    A = 19.3deg.

  • physics please please please please please - ,

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