Posted by BBB on Thursday, July 8, 2010 at 5:08pm.
A merrygoround has a mass of 1580 kg and a radius of 7.25m. How much net work is required to accelerate it from rest to a rotation rate of 1 revolution per 7.1s? Assume it is a solid cylinder.

Physics  drwls, Thursday, July 8, 2010 at 6:35pm
The work required equals the final kinetic energy.
The Kinetic Energy is (1/2) I w^2
The moment of inertia (for a solid disc) is (1/2)M R^2.
w = (2 pi radians)/7.1 s = 0.885 rad/s
is the angular velocity
Put it all together. 
Physics  Anonymous, Sunday, April 13, 2014 at 8:08pm
32522J