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Math Help - Linear velocity!

  1. #1
    Junior Member
    Feb 2009
    Fiery pits of confusion

    Linear velocity!

    Consider the tip of each hand of a clock. Find the linear velocity in mm per second for each hand.
    a. second hand which is 30 mm.
    b. minute hand which is 27 mm long
    c. hour hand which is 18 mm long
    I'm so seriously stumped!
    Here's what I know:
    that's linear velocity.
    The second hand moves 30 mm/second? That can't be right, as the linear velocity would be...840 mm/s.
    Agh, help? :]
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  2. #2
    MHF Contributor Calculus26's Avatar
    Mar 2009
    the second hand rotates 2pirad/60 sec

    v = 30mm*2pi/60sec = pi mm/sec

    similar for the rest
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