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    matzie1226's Avatar
    matzie1226 Posts: 2, Reputation: 1
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    #1

    Jan 17, 2011, 10:21 AM
    Tangental velocity
    A fly on the outer edge of a 4m diameter airplane propeller starts from rest and rotates 800 times in 8 seconds. Find the tangental velocity after 8 seconds.

    I have no idea how to figure this out can someone help me!
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jan 17, 2011, 10:41 AM

    Recall:

    t = 8 s
    u = 0
    s = 800 * Circumference
    a = ?

    to find the acceleration

    Then use:

    v = u + at

    to find the final speed v.
    matzie1226's Avatar
    matzie1226 Posts: 2, Reputation: 1
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    #3

    Jan 17, 2011, 10:53 AM
    Comment on Unknown008's post
    What's the circumference for s 800 times what?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Jan 17, 2011, 11:08 AM

    Remember:



    You have d, the diameter.
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