An iron bar can be made magnetic when
its magnetic domains line up
it rotates its poles to line up with another magnet
it spins its electrons in different directions

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.

Astudent is working in the lab to determine how time affect impulse the student keeps the force the same in each row but changes impact the time some data is shown witch trial has the greatest a student is working in the lab to determine how time affect impulse the student keeps the fours the same in each row but change is the impact time some data shown witch trial has the greatest impulse

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction