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1. A cylinder fitted with a frictionless piston contains 10 lbm of superheated refrigerant R-134a vapor at 100 lbf/in.2, 300 F. The setup is cooled at constant pressure until the R-134a reaches a quality of 25%. Calculate the work done in the process.
2. A piston of 4 lbm is accelerated to 60 ft/s from rest. What constant gas pressure is required if the area is 4 in.2, the travel distance is 4 in., and the outside pressure is 15 psia?
The characteristics of the line are 5,000 ft of steel pipe (e = 0.00015 ft) which has an ellipsoidal cross section (flow area = 4 ft^2; wetted perimeter = 8 ft); three standard elbows (K = 0.9 per elbow); a globe valve (K = 10); and a re-entrant p..
An electronic device is available that will reduce year'slabor cost by $10,000. the equipment is expected to last for eightyears. If labor is cost increase at an average rate of 7% per year and the interest rate is 12% per year
A trough is 5 feet long and 1 foot high. The vertical cross-section of the trough parallel to an end is shaped like the graph of y=x6 from x=?1 to x=1 . The trough is full of water. Find the amount of work in foot-pounds required
Neglect the mass of the cables and treat the chair and person as one particle.
How much contact time would be reuired for inactivating Giardia cysts using the following chemicals at the concentrations and temperatures stated: a. Chlorine Dioxide, 23C, 1.0 mg/L b. Chlorine, 12C, 1.6 mg/L c. Ozone, 10C, 5 mg/L d. Chloramines, 20C..
You open a 16 oz (1 pint) bottle of a carbonated soft drink that has a temperature of 5°C, then you get distracted and forget to drink it. You come back quite some time later and find that it has gone "flat," and that it has gotten warm (20°C).
No more than 12 units of TV, 40 units of radio and 25 units of direct mail are available. A minimum of 9 units of radio and 5 units of direct mail must be purchased.
Design a hardwood beam to support a uniformly distributed load of 20 kN over a simply supported span of 8 m. consider bending strength only. Assume that the weight of the beam is 2 kN.
The de-carburization of a steel can also be described by the error fuction. Starting with the equation, (cx-c0)/(sc-c0) = 1-erf(x/(2*(sqrt(Dt)))), and taking cs=0 derive an expression to describe the concentration profile of carbon as it diffuses out..
a 200ft tape is hung in catenary. It is supported at the 80ft mark the tension is 20lbf and the weight of the tape is 3 lbf 5 0z. The measured distance is 187.01 what it the distance after adjusting for sag
The only work interaction between the system and the surroundings is via the paddle wheel. The work done on the system via the paddle wheel is 220 ft*Ibf and the heat interaction can be assumed negligible.
Given that uniform flow is subcritcal and there is a constriction in a rectangular channel, how do you determine what the constricted width would be to force the flow to be critical. Draw this transition on a specific energy curve.
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