What is the speed of her hands if they are 140 cm apart?

NetherCraft 0

A skater holds her arms outstretched as she spins at 180 rpm.

1 Answer

  • 180rpm = 3 rotations per second

    i.e. 3 x 360 degrees per second

    =1080 degrees a second.

    i rotation is equivalent to travelling 2 x 3.14 x 70 (as radius of rotational motion is 140/2 = 70cm)

    that is equal to 439.6cm

    therefore distance travelled in 1 second = 4.39m x 3=13.188m/s

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