Troubled

[physicsss]

Can someone explain to me why the I of the solution for part b) is 1/2MR^2+M(2R)^2 instead of 1/2MR^2+M(R)^2?

The problem is here: http://dept.physics.upenn.edu/courses/gladney/phys150/quizzes/quiz7_fall_97.html

solution is here:
http://dept.physics.upenn.edu/courses/gladney/phys150/quizzes/quiz7_fall_97_solns.html

[futb0l]

remember the parallel axis theorem - I + md^2 - in your case the axis of rotation is at the end of the cylinder which means that d^2 = r^2.

looks like a mistake.

[Doc Al]

Can someone explain to me why the I of the solution for part b) is 1/2MR^2+M(2R)^2 instead of 1/2MR^2+M(R)^2?

I looks like a mistake to me. :smile: