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Math Help - Revolutions Per Minutes

  1. #1
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    Revolutions Per Minutes

    A pulley that has a diameter of 8 inches is belted to a pulley that has a diameter of 12 inches. The 8-inch-diameter pulley is running at 1,548 revolutions per minute. If the speeds of the pulleys vary inverselyto their diameters, how many revolutions per minute does the larger pulley make?
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  2. #2
    Like a stone-audioslave ADARSH's Avatar
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    Wink ..try this

    A pulley that has a diameter of 8 inches is belted to a pulley that has a diameter of 12 inches. The 8-inch-diameter pulley is running at 1,548 revolutions per minute. If the speeds of the pulleys vary inverselyto their diameters, how many revolutions per minute does the larger pulley make?
    ---according to question-----
    speed=k/diameter......(k=arbitary constant)
    now applying for first and second pulley
    u get
    8=k/1548......(1)
    12=k/?..........(2)
    get k from ( 1) put it in (2) u get the ans
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  3. #3
    MHF Contributor
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    great....

    Quote Originally Posted by ADARSH View Post
    A pulley that has a diameter of 8 inches is belted to a pulley that has a diameter of 12 inches. The 8-inch-diameter pulley is running at 1,548 revolutions per minute. If the speeds of the pulleys vary inverselyto their diameters, how many revolutions per minute does the larger pulley make?
    ---according to question-----
    speed=k/diameter......(k=arbitary constant)
    now applying for first and second pulley
    u get
    8=k/1548......(1)
    12=k/?..........(2)
    get k from ( 1) put it in (2) u get the ans
    I can take it from here.
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