It requires 1250 J of work to lift a car high enough to change a tire. How much work must done by the person operating the lift if the car jack is 45% efficient?

What happens when you slowly pulled the carboard?

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

Derive the lens makers formula for convex les?