physics

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A rock stuck in the tread of a 57.0 cm diameter bicycle wheel has a tangential speed of 3.00 m/s. When the brakes are applied, the rock's tangential deceleration is 1.40 m/s^2.
At what time is the magnitude of the rock's acceleration equal to g?

  • physics -

    The magnitude of the rock's acceleration during deceleration in is
    sqrt[(a_t)^2 + (V^2/R)^2]
    Set that equal to g = 9.8 m/s^2
    fo get the velocity V when the acceleratikon magnitude is g.

    The tangential acceleration is
    a_t = 1.4 m/s^2

    Therefore
    9.8^2 = 1.96 + V^4/2
    V^2/R = 9.7 m/s^2
    Since R = 0.285 m,
    V = 1.66 m/s

    Solve for the time t when
    1.66 = 3.00 - 1.40 t m/s

    V = 3.00 - 1.4t m^2

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