How much energy is need to heat up 1kg of water by 15 degrees

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

Acar traveling at 21 m/s starts to decelerate steadily. it comes to a complete stop in 13 seconds. what is its acceleration?

If two ends a and b are connected through a metallic wire. if electrons flows from point b to point a. what can you say about the potential a and b.