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Physics

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An electric motor rotating a workshop grinding wheel at a rate of 95 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.40 rad/s2.
(a) How long does it take for the grinding wheel to stop?

(b) Through how many radians has the wheel turned during the interval found in (a)?

  • Physics - ,

    a. V=95rad/min * 6.28rad/rev * (1/60)min/s = 9.94rad/s.

    Vf = Vo - at = 0,
    9.94 - 2.4t = 0,
    -2.4t = - 9.94,

    t = 4.14s.

  • Physics - ,

    b. d=9.94rad/s * 4.14s = 41.2 radians.

  • Physics - ,

    For part B you have to divide the 9.94 by 2 then multiply by time

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