6) mechanical (sound) waves are unable to travel through a vocuurn, such os through space, but r from satelites how is this possible? adio waves are tronomitted to earth a) radio woves are electromagnetic waves b) sotelites are located within our atmosphere c) radio woves are very high energy mechorical woves radio woves are changed to gamma roys for franernission d) 7) electromagnetic vs. mechanical

Which scientist was the first to propose the heliocentric model of the universe? a. aristotle b. isaac newton c. galileo galilei d. nicolaus copernicus

If jason ii needs 15 kw of power at 300 volts to operate, what amperage of current must flow through the cable?

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