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1. A cylinder/piston contains 100 L air at 110 kPa, 25?C. The air is compressed in a reversible polytropic process to a final state of 800 kPa, 500 K. Assume the heat transfer is with the ambient at 25?C and determine the polytropic exponent n and the final volume of the air. Find the work done by the air, the heat transfer, and the total entropy generation for the process.
2. A room at 22?C is heated electrically with 1500 W to keep a steady temperature. The outside ambient is at 5?C. Find the flux of S (=Q? /T) into the room air, into the ambient, and the rate of entropy generation.
3. A mass of 3 kg nitrogen gas at 2000 K, V = C, cools with 500 W. What is dS/dt?
Compare and contrast four-way traffic signal controlled intersections versus four-way roundabouts. In your response, discuss the safety implications of each as well as the traffic performance implications. Word limit is 500 words.
A gas solution has the following composition, Oxygen = 35 g Nitrogen = 40 g Neon = 25 g Calculate mass fractions of all components. If you remove Neon, how much you have to remove to reduce mass fraction to 0.1
determine the force in member AC, FH, and FG and indicate if the member is in tension or compression. List all zero force members.
The modulus of elasticity of an un-identified metal is known to be 3000 ksi. An engineer has to design a rod with a fixed diameter to carry a load, P, and wishes to keep the deformations in the rod to a minimum.
A project consists of replacing the track on an existing railroad line, involving 3000 feet of track. The old track can be removed at a rate of 70 feet per hour. The old railroad ties can be removed at a rate of 200 feet (measured along the track) pe..
Street paving design requirement - Geometric design of subdivision streets and determine adequate thoroughfare requirements and special design features.
The number of flaws on a sheet of aluminum manufactured by a certain process follows a Poisson distribution. In a sample of 100m2 of aluminum, 200 flaws are counted.
A) Estimate the aquifer porosity and hydraulic conductivity, B) determine the flow rate per unit width of the aquifer, C) determine the specific discharge, D) determine average linear velocity of the flow assuming steady unidirectional flow
A truck is designed to measure concrete roughness. During a typical test the driver will bring the vehicle to a constant test velocity, v, and then suddenly lock the brakes bringing the vehicle to a complete stop.
The National Institute for Occupational Safety and Health (NIOSH) sets standards for CCl4 in air at 12.6 mg/m^3 of air (a time average over 40 hr). The CCl4 found in a sample is 4800 ppb. Does the sample meet the NIOSH standard
The force of the expanding gases on a 0.02 kg bullet is given by f=f0-f.1*t . Initially stationary at x=0 , the bullet reaches a speed of 1000 kph by the time it exits the gun. f0 = 7000 N and f1=2.9*106 N/s.
A watershed has four sub-areas. The annual precipitation and evaporation from each of the sub-areas are given in Table(below). Assume that there is no change in groundwater storage on an annual basis and calculate for the whole catchment the value..
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