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Math Help - another trigonometry word problem

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    another trigonometry word problem

    Electric Motor. if a 2 inch diameter pulley that's being driven by an electric motor and running at 1600 revolutions per minute is connected by a belt to a 5 inch diameter pulley to drive a saw, what is the speed of the saw in revolutions per minute?
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    Quote Originally Posted by 08gakawa View Post
    Electric Motor. if a 2 inch diameter pulley that's being driven by an electric motor and running at 1600 revolutions per minute is connected by a belt to a 5 inch diameter pulley to drive a saw, what is the speed of the saw in revolutions per minute?
    Use the same method as angel.white has described here http://www.mathhelpforum.com/math-he...306-post2.html

    The product of revolutions times circumferences must be constant:

    r_1 \cdot c_1 = r_2 \cdot c_2 . Plug in the values you know:

    1600 \cdot 2\pi = r_2 \cdot 5\pi . Solve for r_2.


    (For confirmation only: r_2 = 640 )
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