Saturday

December 20, 2014

December 20, 2014

Posted by **Eric** on Saturday, June 2, 2012 at 8:09pm.

(a) What is the radius of the circle they now skate in?

(b) What is the angular speed of the skaters?

(c) What is the kinetic energy of the two-skater system?

(d) Next, the skaters pull along the pole until they are separated by 0.7 m. What is their angular speed then?

(e) Calculate the kinetic energy of the system now.

- Physics -
**drwls**, Sunday, June 3, 2012 at 1:42am(a) 1.9 m

(b) w = V/R = 1.0 rad/s

(c) 55*(1.9)^2 Joules

(d) angular momentum is conserved and they speed up by a factor 3.8/0.7

(e) Do the numbers. Kinetic energy increases by a factor equal to the square of the velocity incorease factor.

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