How long must a technician evacuating refrigerant from appliances with a ball carge imora pounds and less than 50 pounds that are being disposed of keep records of the ret?
A. 1 year
B. 3 years
C. 5 years
D. 10 years

The flow rate of air through a through a pipe is 0.02 m5/s. a pitot static tube is placed in the flow. the radius of the pitot static tube is 1 mm. assuming the flow to be steady and the air to be at 300k, calculate the difference in total and static pressure if the diameter of the pipe is: (a) d 0.1 m d 0.05 m (c) d 0.01 m