(a) A point charge has q=1.0×10-6 coul. Consider point A 2.0 meters distant and
point B 1.0 meter distant from the charge.
i) If point A is on east side of the charge and point B on west side of the
charge, what is the potential difference VA-VB? Draw a diagram of the
arrangement.
ii) If point A is on east side of the charge and point B on north side of the
charge, what is the potential difference VA-VB? Draw a diagram of the
arrangement.

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.

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.

Observations show that interstellar clouds can have almost any shape and