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Physics

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The equation describing the velocity of the ice falling from the wing as a function of time is v=45(1-(0.804)^t). Determine algebraically the time required, to the nearest tenth of a second, for the ice to reach a velocity of 98% of its terminal velocity of 45 m/s.

(v=velocity)

Please help me. Thank-you!

  • Physics - ,

    Since it is not specified in the question, we will assume that the equation for v as a function of time is in m/s.
    Thus
    v(t)=45(1-(0.804)^t) m/s
    where t is in seconds.
    A plot of the graph of v(t) versus t will shed some light.
    http://i263.photobucket.com/albums/ii157/mathmate/terminalVelocity.png

    Let v1=98% of terminal velocity of 45 m/s
    then we look for the value of t1 such that
    v(t1)=45*0.98
    or
    45*(1-0.804^t1) = 45*0.98
    0.804^t1=1-0.98=0.02
    Can you take it from here?
    Hint: solve for t1 either by trial and error or apply the laws of logarithm.

  • Physics - ,

    0.804^t= 0.02
    t*log(0.804)-log(0.02)
    t=log(0.02)/ log(0.804)
    t= 17.9

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