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A large plastic casting with thermal diffusivity 6.0*10-7 m2/s is removed from its mold at a uniform temperature of 150oC. The casting is then exposed to a high-velocity air stream such that the surface experiences a sudden change in temperature to 20oC. 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.
the cooling water flow rate to the condensers of a big coal-fired power plant is 8460 kgs. the water enters the
a piston-cylinder device containing water undergoes a thermodynamic cycle consisting of the following three
if the atmospheric pressure is 1.025 bar at a location where you can dive in a lake to 30ft below the surface and then
what are the properties of petrol that it makes particularly suitable for the use as afuel in a motor vehicle.
honda civic 2012 model has an epa rating of 28 mpg city and 39 mpg highway. what is the thermal efficiency of honda
It is known that a long log floats with its axis horizontal. A very short log, however, floats with its axis vertical. Determine the maximum length of a cylindrical walnut log 30 cm in diameter that will cause it to float with its axis vertical.
water vapor enters a turbine at 6 mpa and 400degc and leaves the turbine at 100 kpa with the same specific entropy as
a pressured air supply is needed to generate a 1200-lb load. the incoming air is 100 psig. the load must be raised at a
A robot arm carrying a 2.75-lb package is moving in a horizontal circle at 4 miles/hr. The arm is gradually shortened for the first 0.11 s of its motion, changing the radius of the circle. The maximum acceleration the package can withstand without da..
an electric light is placed directly over the center of a circular plot of lawn 100m in diameter. assuming that the
an air-water vapor mixture at 0.1 mpa 30degc 80 rh has a volume of 50 m3. calculate the specific humidity dew point wet
the blade assembly of an oscillating fan rotates with a constant angular velocity w1 -360rpm i with respect to the
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