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Thread: [SOLVED] Velocities help

  1. #1
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    [SOLVED] Velocities help

    Woot i finally finished all my hw except i couldnt figure otu how to solve 6 problems. can you guys help me out plz!? thxs!


    Last edited by S2Krazy; Oct 4th 2009 at 10:19 PM.
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  2. #2
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    1) One full rotation is [tex]2\pi[tex] radians. If it rotates $\displaystyle 2\pi$ radians in 23 hours, it rotates $\displaystyle 2\pi/23$ radians in one hour.

    2) The circumference of a circle 14 feet in diameter is $\displaystyle 14\pi$ feet. If the wheel does 17 revolutions per minute, its circumference moves $\displaystyle 17(14\pi)$ feet per minute.
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  3. #3
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    i think im a little confused still on 1. so t=23 and theta = 2pi/23. so divide this and i get 2pi is this correct???



    also im a bit confused still on 2.

    I know the formula to use should be v=s/t. so if t= 17. and s = 14pi then divide those should be 14pi/17 but this doesnt seem right.







    can anyone help me out on!? 3-5
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  4. #4
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    alright so i figured out all of it but the last two! (so i deleted the other pic)

    so yeah im stuck on 4 and 5..


    for 4 i i know i did 44/6(44pi/3) but it says im wrong..


    and for 5 i thought i did it all correct but it doesnt look liek i did... for the chain i got 789600pi mm/hr, for the sprocket i got 16623.15789pi mm/hr, and for the Vtire i got 1163621.053pi mm/hr, and for the end result i got 3.655623351 km/hr but it says im wrong.




    nvm i got it all done finally...
    Last edited by S2Krazy; Oct 4th 2009 at 11:53 PM.
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