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Radians

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The angular speed of a large pulley wheel that has a radius of 15, is 50 revolutions/min. Find the angular speed and the rim speed of the smaller wheel that has a radius of 5.

The rim speed is going to be the same.
I got the angular speed but I can't figure out why the rim speed is 4700 cm/min.

Please Help

  • Radians - ,

    rim speed=angular speed*radius
    rim speed=50rev/min*2PIrad/1rev*15cm
    = 4700cm/min

  • Radians - ,

    where did you get the 2Plrad?

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