Which best describes the current atomic model?

a: it is not an exact representation of the atom, but is close enough to be very useful.
b: it is not an exact representation of the atom, so it is not very useful.
c: it describes exactly how the atom behaves in every circumstance.
d: it is so trusted that no new information could possibly cause a change to the model.

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