Abeam of light, which is traveling in air, is reflected by a glass surface. does the reflected beam experience a phase change, and if so, by how much is the phase of the beam changed?

What is a possible result of higher air temperature caused by global warming

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

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