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In the casting of steel under certain mold conditions, the mold constant in Chvorinov's rule is know to be 4.0 min/cm2 , based on previous experience. The casting is a flat plate whose length = 30cm, width = 10cm, and thickness = 20cm. Determine how long it will take for the casting to solidify. If solving for the total solidification time in the previouse problem and using an exponet value of 1.9 in Chvorinov's rule instead of 2.0, what adjustment must be made in the units of the mold constant?
an air conditioner using r-134a as the working fluid and operating on the ideal vapor-compression refrigeration cycle
1. imagine a thin cylinder of initial internal diameter do initial wall thickness to and initial fixed length
The lamp has a mass of 15 kg and is supported by a pole AO and cables AB and AC. If the force in the pole acts along its axis, determine the forces in AO, AB, and AC for equilibrium.
refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 35 degrees c at a rate of 0.018 kgs and
water enters a nozzle with a velocity of 0.8 ms and exits with a velocity of 5 ms. the nozzle entrance diameter is 12
a household refrigerator that has a power input of 450 w and a cop of 2.5 is to cool five large watermelons 10 kg each
a car a is travelling on a straight level road with a uniform speed of 60 km h-1. it is followed by another car b which
it is desired to study the effect of turbine inlet temperature on the performance of an ideal steam rankine cycle.
The angular acceleration of a shaft is defined by the relation a = -0.25w, where a is expressed in rad/s^2 and w in rad/s. Knowing that at t=0 th angular velocity of the shaft is 20 rad/s, determine the time required for the shaft to come to rest.
an air-standard otto cycle operates with 520 degrees r and 14.7 psia at the beginning of the compression portion of the
a 12-in radius cylinder of weight 16lb rests on a 6lb carriage. the system is at rest when a force p of magnitude 4lb
a household refrigerator with a cop of 1.8 removes heat from the refrigerator space at a rate of 90 kjmin. determine
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