How do simple machines make work easier a. they increase the force needed to work
b. they add energy to work
c. they reduce the speed of work over a long period of time
d. they increase the distance over which a force is applied

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.