The volume of a gas v held at a constant temperature in a closed container varies inversely with its pressure p. if the volume of a gas is 1000 cubic centimeters when the pressure is 450 mm hg, find the volume when the pressure is 250 mm hg.

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