The mass of a star is 1.61·1031 kg and its angular velocity is 1.60e-7 rad/s. find its new angular velocity if the diameter suddenly shrinks to 0.29 times its present size. assume a uniform mass distribution before and after. icm for a solid sphere of uniform density is 2/5 mr2. 1.90×10-6 rad/s

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill