an object with a normal force of 75N RESTS on concrete, what is the coefficient of statics friction if it takes 60N of applied force for the object to start sliding?

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

A40.0 l tank of ammonia has a pressure of 12.7 kpa. calculate the. volume of the ammonia if it’s pressure is changed to 8.4 kpa while its temperature remains constant.