A0.75-kg ball is attached to a 1.0-m rope and whirled in a vertical circle. the rope will break when the tension exceeds 450 n. what is the maximum speed the ball can have at the bottom of the circle without breaking the rope?

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