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Consider a cold aluminum canned drink that is initially at a uniform temperature of 4°C. The can is 12.5 cm highand has a diameter of 6 cm. The emissivity of the outer surface of the can is 0.6. Disregarding any heat transfer from the bottomsurface of the can, determine how long it will take for the average temperature of the drink to rise to 20°C if the surroundingair and surfaces are at 25°C. Answer: 12.1 min
an insulated rigid container is separated into two parts using a partition that is free to move and the partition
a well insulated piston-cylinder assembly is connected to an air supply line at 8 bar as shown in the figure. initially
when the air temperature in an automobile tire is 25oc the pressure gage reads 210 kpa. if the air volume in the tire
Considering the flow of a uniform stream of speed V in the x-direction, a source of strength Q at (-1,0) and sink of strength Q at (1,0). Find the velocity potential and the stagnation points
a 1 m3 tank containing air at 25oc and 500 kpa is connected through a valve to another tank containing 5 kg of air at
Superheated steam enters one section of an open end feed water heater at 5bar and 240 c with a mass flow rate of 1 kg/s. compressed liquid water at the same pressure and 35 C enters another inlet. The mixture of these two streams leaves as a saturate..
a thick steel slab 7800 kgm3 c 480 jkg k k 50 wm k is initially at 300 c and is cooled by water jets impinging on one
what is the density of solid aluminum at the melting temperature? what is the density of liquid aluminum at the melting
water is the working fluid in an ideal regenerative rankine cycle with one open feedwaer heater. superheated vapor
q1 the pressure in an air tank is able to support a water column 15 meter high. find the absolute air pressure in psi
The vapour has 5 K of superheat at entry to the compressor.In each case calculate the C.O.P.(ref.) and the refrigerating effect per kg. What would be the C.O.P.(ref.) of a reversed Carnot cycle operating between the same saturation temperatures?
If the filling is done rapidly, calculate the final temperature in the small cylinder, (a) assume that oxygen is an ideal gas with Cv= 5R/2 and (b) using accurate thermodynamic data for oxygen.
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