An electron moves in a circular path perpendicular to a magnetic field of magnitude 0.275 t. if the kinetic energy of the electron is 4.90 10-19 j, find the speed of the electron and the radius of the circular path.

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