An observer at rest on Earth finds that a spacecraft is approaching Earth at a speed equal to 0.99c relative to Earth. A light signal emitted by the ship has a duration equal to 2.2µ/sec in relation to an observer inside the ship. What is the duration of this signal relative to the observer at rest on Earth?

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