Which of the following expressions gives units of kg. m2/s2? a. m2.Ax/(At)2
b. m.(Ax)2/At
c. m.(Ax)2/(At)2
d. (At)2/m.(Ax)2

Will you chech and finish these for me, because i am stumped with them.

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.

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.