A car is sitting motionless on top of a bridge. The bridge pushes up on the car with a force of 782 Newtons. What force must gravity pull down on the car with in order to break the bridge? Explain how you determined your answer.

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