1. The problem statement, all variables and given/known data A hoop of mass 1kg and radius 2m is rotating about its center with an angular speed of 3rad/sec. A force of 10N is applied tangentially at the rim. a. The rotational kinetic energy of the hoop is? b. The instantaneous rate at which the kinetic energy is changing is? 2. Relevant equations KE= 1/2Iw^2 3. The attempt at a solution For the first part I can find I= MR^2 for a hoop, so I= (1)(2^2) so I=4. So KE= 1/2Iw^2 = (1/2)(4)(3^2)= 18. What do I do with the extra 10N applied (do I just add it in or does it not factor into the rotational kinetic energy?) I don't know what equation to use for the second part.