A ball is dropped from 34.8 ft above the ground. Assume that air-drag is negligible in this case. (a) At what height is half of its energy kinetic and half potential?
ft

(b) Using energy considerations only, what is the velocity of the ball just as it hits the ground?

ft/s

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

A75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high-efficiency motor that has an efficiency of 95.4 percent. the motor operates 4368 hours a year at a load factor of 0.75. taking the cost of electricity to be $0.12/kwh, determine the amount of energy and money saved as a result of installing the high-efficiency motor instead of the standard motor. also, determine the simple payback period if the pu

Ahockey puck sliding along frictionless ice with speed v to the right collides with a horizontal spring and compresses it by 3.0 cm before coming to a momentary stop.