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With the aid of Chvorinov’s rule, calculate the relative solidification times for castings of identical volumes of the following shapes: (a) sphere of diameter ds,; (b) cylinder with h/d =1; (c) cylinder with h/d =10; (d) cube; (e) right rectangular prism with length h (h/a =10 and h/b=10); (f) flat plate of the same length as (e) but of 1/3 the thickness. Plot the results (a to e) to illustrate the effect of shape changes.
the spring mounted slider moves in the horizontal guide with negligible friction and has a velocity vo in the
A rigid tank contains 5.56 kg of an ideal gas at 3.6 ATM and 40 degrees Celsius. Now a valve is opened and half of the mass of the gas is allowed to escape. If the final pressure in the tank is 2.0 ATM, the final temperature of the tank is?
an air standard cycle with variable specific heats is executed in a closed system and is composed of the following four
a contractor is required to prepare a soil surface so that its planar and the normal direction to the surface is within
the molar heat capacity of liquid iron exceeds that of iron vapor by 2.5222calkthe molar heat of evaporation of liquid
A cold air-standard Brayton refrigeration cycle has a pressure ratio of 4 and a refrigeration rate of 15 kW. Air enters the compressor at -7oC. The high pressure air is cooled to 27 oC by rejecting heat to the surroundings. It is further cooled to -1..
in a hydroelectric power plant water enters the turbine nozzles at 800 kpa absolute with a low velocity. if the nozzle
A t=10-mm-thick horizontal layer of water has a top surface temperature of Tc = - 4 C and a bottom surface temperature of Th = 2 C. Determine the location of the solid-liquid interface at steady state.
your job is to create a design of Rankine cycle that create the most possible power from this heat source . you may use any working fluid for which you can find the properties , assume the turbines 92% efficient and pumps 85%
according to test data a new type of engine takes in streams of water at 400 degrees f 40 psia and 200 degrees f 40
a battery manufacturer guarantees that his batteries will last on average 3 years with a standard deviation of 1 year.
team dynamic are based on a number of interpersonal and environmental factors that influence a teams behavior. what
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