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Four pounds of air is compressed in a cylinder-piston arrangement while the temperature remains constant at 70°F. If the initial pressure is 30 psi absolute, calculate the work needed to compress the air such that the absolute pressure doubles. Also calculate the heat transfer.
In an Egg Drop competition, one would like to compute the time history of the velocity of the designed egg protection system, which has a mass of .5 kg, an initial velocity of zero, and a drag proportional to the velocity( D = C_d * V, where C_d = .1..
a water-coolerice-maker operates at steady-state producing chilled water at 5 c and ice at -10 c from tap water at 20c.
the critical heat flux of water at 1 atm is qmax 1258.7 kwm which occurs at ?t 30c. boiling enters the transition
What is the difference between recirculating and noncirculating hot water systems, and where would the circulating system most likely be used?
suppose that 1 kg of saturated water vapor at 100ordmc is condensed to a saturated liquid at 100ordmc in a
Determine the maximum work that can be extracted from a pond containing 105 kg of water at 350 K when the temperature of the surroundings is 300 K. Notice that the temperature of water in the pond will be gradually decreasing as energy is extracte..
refrigerant 134a flows at steady state throught a horizontal pipe having an inside diameter of 4 cm entering as
a gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processesprocess
a random sample of 12 shearing pins is taken in a study of the rockwell hardness of the pin head. measurements on the
Consider a cubic crystal with the lattice constant a.Sketch the unit cell with the crystallographic planes having Miller indices (011) and (033). What is the spacing d between these two parallel planes? Explain your answer. Include additional sketche..
r-134a is throttled from 1200kpa and 40oc to 200kpa. it is known that heat of 5kjkg is lost from r-134a to the
When a total amount of 125,000 joules of heat is transferred to a piece of 5 kg alloy, its temperature changes from 25 C to 60C, what is the specific heat capacity of this material?
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