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25 February, 03:14

Ursula and her friends are playing hoop rolling. Ursula rolls a large hoop along the ground. The hoop rotates through an angle of 3/2 times pi radians in 1 second. How many revolutioins does the hoop make in one minute?

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  1. 25 February, 03:31
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    1 revolution = 360 degrees

    3/2pi = 1 second

    1 revolution = 2pi radius

    3/2pi (360/2pi) = 3/2pi (180/pi) = 270 degree sec.
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