The spin-drier of a washing machine slows down uniformly from 880 rpm (revolutions per minute) to 260 rpm while making 50 revolutions. Find the angular acceleration through these 50 revolutions. Express your answer in rad/s2.

Question

The spin-drier of a washing machine slows down uniformly from 880 rpm (revolutions per minute) to 260 rpm while making  50 revolutions.  Find the angular acceleration through these 50 revolutions.  Express your answer in rad/s2.

The answer is -12.3359871531. I got -13.42.

Steve · Answer

You can easily adapt the example here to fit your problem: http://physics.bu.edu/~redner/211-sp06/class13/class13_rotation.html