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The state of 1 lbm of steam is changed from saturated vapor at 20 psia to superheated vapor at 50 psia and 1000 F. What are the enthalpy and entropy changes of the steam? What would the enthalpy and entropy changes be if steam were an ideal gas?
A steel rod 1 cm in diameter and 30 cm long protrudes from a steel surface at 150 C. The rod is surrounded by air at 10 C with a convective heat transfer coefficient of 10 W/m2 C. The thermal conductivity of steel is 114 W/m C. Determine the heat ..
Determine the forces in members DE,DF, and EF of the scissors truss shown. Also, state whether the members are in tension or compression. Note that the 400 lb force is directed along the line BF and the 800 lb force is parallel to line BF.
a 2 kg block of wood rest on the table top. A 7g bullet is shot straight up through a hole inthe table beneath the block. the bullet lodge in the block and the flies 25 cm above the table top. how fast was the bullet going initial?
A reverse Brayton cycle refrigeration system uses air as the working fluid. The turbine and compressor operate ideally, and regeneration (recuperation) is used in the cycle. The pressure ratio is 5. Air enters the compressor at 12.5 psia, 70°F. After..
before installing the water pipes in a new house an engineer measured the pressure in main water line near the house to
a first class lever in static equilibrium has a 50lb resistance force and a 15lb effort force. the levers effort force is located 4ft from the fulcrum. what is the actual mechanical advantage of the system?
two processes are used to produce forgings used in an aircraft wing assembly. of 200 forgings selected from process 1
in the bird-on-a-wire group work example how do you expect the angle and tension to be related? remember that this is
a water stream is heated in fully developed flow through a pipe with uniform heat flux at the wall. the flow rate is
the motion of the uniform slender rod of length l0.5 m and mass m 3 kg is guided by pins at a and b that slide freely
air in a piston-cylinder device has 400 degrees f 1000 kpa with a volume of 3.5 ft3. combustion heats it to 1500 k in a
crates a and b weigh 100 lb and 50 lb respectively. if they start from rest determine the their speed when t 5s. also
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