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A large plastic casting with thermal diffusivity 6.0 x10^7 m2 /s is removed from its mold at a uniform temperature of 150 degrees C. The casting is then exposed to a high-velocity air stream such that the surface experiences a sudden change in temperature to 20 degrees C. Assuming the casting approximates a semi-infinite medium and using a finite-difference method with a space increment of 6mm, estimate the temperature at a distance of 18 mm from the surface after 3 min have elapsed.
a rocket has an initial mass of 25000 kg of which 20000 kg is fuel and oxygen. it is propelled directly upward from
the masses of a b and c are 5 kg 15 kg and 100 kg respectively. the coefficient of friction between all contacting
on an assembly line that fills 8-ounce cans a can will be rejected if its weight is less than 7.90 ounces. in a large
a horizontal 500 lb force performs at a point d of crankshaft ab which is held in static equilibrium by a twisting
find the stresses in a point of a rod that is fixed to a wall and have a load in the edge or better known as a cantilever.
an airplane wing modeled as a spring-mass system with natural frequency 40 hz is driven harmonically by the rotation of
gas with an initial volume of 0.36 m3 is slowly compressed to a final volume of 0.16 m3 by a process during which the
steam enters an insulated turbine at 100 bar 400oc. at the exit the pressure and quality are 200 kpa and 0.66
a kitchen contains a standard refrigerator and a window air conditioner. the refrigerator operates at steady state
at steady state a refrigeration cycle maintains a freezer at -2degc removing energy by heat transfer from the food
an open feedwater heater operates at steady state with liquid water entering at inlet 1 at 50 degrees celsius and 1
the fatigue data for a brass alloy are given as followsstress amplitude mpa -----------------cycles to failure310
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