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A piston cylinder combination contains 2 kg of air at the ambient temperature of 25C and at the unknown ambient pressure. To provide a source of cooling on this hot Florida day, the piston is now pulled up until the air reaches a temperature of -100C. It can be assumed that the process is a polytropic one with . What is the work that must be done on the air in the cylinder to pull up the piston and produce the cold air? The piston must also do work on the air outside the cylinder, which remains at the ambient pressure. What is the expression for that work?
A lake with a surface area of 1050 acres was monitored over a period of time. During a one month period, the inflow was 33 cfs, the outflow was 27 cfs, and a 1.5 in seepage loss was measured.
For energy conservation, materials with a high thermal capacity are effective in climates in which the heat flow through the building envelope is:
A 5-m-diameter parachute of a new design is to be used to transporta load from flight altitude to the ground with an average verticalspeed of 3 m/s. The total weight of the load and theparachute is 200 N. Determine the approximate dragcoefficient for..
given bulk density as 1300kg/cubic meter and field capacity as 22% by weight and permanent wilting point as 10% by weight calculate available water capacity.
The acceleration of a particle traveling along a straight line is A= (0.02e^t) m/s^2, where t is in seconds. If v=0, s=0 when t = 0, determine the velocity and acceleration of the particle at S= 4m
A cylinder fitted with a piston has a volume of 2ft^3 and contains 0.5 lbm of steam at 60 psia. Heat is tranferred to the stream until the temperatureis 500 F, while the pressure remains constant
Show that the ultimate load for a strip footing under long-term conditions using the two triangle failure surfaces
At a specified point on a highway, vehicles are known to arrive according to a Poisson process. Vehicles are counted in 20-second intervals, and vehicle counts are taken in 120 of these time intervals.
A soil sample taken from a borrow pit has a natural void ratio of1.15. The soil will be used for a highway project where a total of 100,000 m3 of soil is needed in itscompacted state; its compacted void ratio is 0.73.
Repeat LEM(Limit Equilibrium Method) analysis in clay (undrained) using a circular failure surface, with the center of the circle a distance h above the edge of the footing. What ratio of h/B gives the minimum value of Nc
When a fluid flows through a sharp bend, low pressures may develop in localized regions of the bend. Estimate the minimum absolute pressure (pmin in psi) that can develop without causing cavitation if the fluid is water at 80 oF.
The slope distance between two points is 72.665 m, and the difference in elevation between the points is 1.120 m. Compute the horizontal distance.
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