Is is a multi-part question. once an answer is submitted, you will be unable to return to this part. refrigerant-134a enters a 28-cm-diameter pipe steadily at 200 kpa and 20°c with a velocity of 4.8 m/s. the refrigerant gains heat as it flows and leaves the pipe at 180 kpa and 40°c. the specific volumes of r-134a at the inlet and exit are 0.1142 m3/kg and 0.1374 m3/kg.

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.