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A block of metal at 120 °C has a 3-cm diameter hemispherical cavity. If the emis-...
2. A hot surface at 120°C is cooled by attaching a 6-cm-long, 0.6-cm-diameter pin fin (k...
2. A hot surface at 120°C is cooled by attaching a 6-cm-long, 0.6-cm-diameter pin fin (k 220 W/m K, a 97.1 x 10 m2/s). The temperature of the surrounding air is 15°C, and the heat transfer coefficient on the fin surface is 30 W/m2 K. Assuming one-dimensional heat conduction along the fin, an adiabatic tip, and taking the nodal spacing to be Ax 3 cm, determine the tip temperature.
One end of a long rod 3 cm in diameter is inserted into a furnace with the
One end of a long rod 3 cm in diameter is inserted into a furnace with the (3 outer end projecting into the outside air. Once the steady state is reached the temperature of the rod is measured at two points, 15 cm apart and found to be 140°C and 100°C, when the atmospheric air is at 30°C with convection coefficient of 20 W/m2.K. Calculate the thermal conductivity of *.the rod material Consider a stainless steel spoon(k = 15.1 W/m.K), partially...
An uninsulated metal sphere with a diameter of 1 cm has a surface temperature of 30...
An uninsulated metal sphere with a diameter of 1 cm has a surface temperature of 30 °C, and is exposed to flow of water at 0 °C. The water moves in cross flow over the sphere with a velocity of 0.1 m/s. Determine the heat loss from the sphere.
A spherical cavity of radius 4.50 cm is at the center of a metal sphere of...
A spherical cavity of radius 4.50 cm is at the center of a metal sphere of radius 16.0 cm . A point charge 3.30 μC rests at the very center of the cavity, whereas the metal conductor carries no net charge. A) Determine the electric field at a point 3.50 cm from the center of the cavity. B) Determine the electric field at a point 7.00 cm from the center of the cavity. C) Determine the electric field at a...
A spherical cavity of radius 7.00 cm is at the center of a metal sphere of...
A spherical cavity of radius 7.00 cm is at the center of a metal sphere of radius 19.0 cm . A point charge 6.80 μC rests at the very center of the cavity, whereas the metal conductor carries no net charge. 1)Determine the electric field at a point 6.00 cm from the center of the cavity. 2)Determine the electric field at a point 11.0 cm from the center of the cavity. 3)Determine the electric field at a point 60.0 cm...
The left end of a long glass rod, 10.0 cm in diameter, has a convex hemispherical...
The left end of a long glass rod, 10.0 cm in diameter, has a convex hemispherical surface 5.00 cm in radius. The refractive index of the glass is 1.60. Determine the position Sy of the image if an object is placed in air on the axis of the rod 4.00 cm from the left end of the rod. Express your answer in centimeters to three significant figures. Pa] ΑΣΦ ? cm 85 = 870 Submit Previous Answers Request Answer X...
3. A 20 cm diameter cooking is over a heater boiling water at 100°C. The bottom...
3. A 20 cm diameter cooking is over a heater boiling water at 100°C. The bottom of the pan is 1 cm thick and the inside surface temperature of the bottom plate in contact with water is 110°C. determine the convective heat transfer coefficient of the boiling water. 'fthe ratcof heat trausfen is 500 watts
Steam enters a horizontal 14-cm-diameter pipe as a saturated vapor at 5 bar with a velocity...
Steam enters a horizontal 14-cm-diameter pipe as a saturated vapor at 5 bar with a velocity of 10 m/s and exits at 4.5 bar with a quality of 95%. Heat transfer from the pipe to the surroundings at 291K takes place at an average outer surface temperature of 400 K. For operation at steady state, determine (a) the velocity at the exit, in m/s. (b) the rate of heat transfer from the pipe, in kW.? (c) the rate of entropy...
A 5-cm-diameter shaft rotates at 4500 rpm in a 15-cm long, 8-cm-outer-diameter cast iron bearing (k...
A 5-cm-diameter shaft rotates at 4500 rpm in a 15-cm long, 8-cm-outer-diameter cast iron bearing (k =70 W/m.K) with a uniform clearance of 0.6 mm filled wwith tubricating oil (u 0.03 N.s/m2 and k 0.14 W/m.K). The bearing is cooled externally by a liquid, and its outer surface is maintained at 40°C. Disregarding heat conduction through the shaft and assuming one- dimensional heat transfer, determine (a) the rate of heat transfer to the coolant, (b) the sutacs temperature of the...
3 3 3 O 2 The width or the rectangular enclosure is 30 cm and the...
3 3 3 O 2 The width or the rectangular enclosure is 30 cm and the height of the enclosure is 20 cm. The diameter of surface 1 is 1 cm. The center of surface 1 is 1 diameter above the bottom surface. 2. If in the above problem, surfaces 1, 2, and 3 are gray with £1 = 0.8, T1 = 2000 K, *2 = 0.9, T2 = 400 K, and €3 – 0.1, T3 = 350 K, what...
2. A hot surface at 120°C is cooled by attaching a 6-cm-long, 0.6-cm-diameter pin fin (k 220 W/m K, a 97.1 x 10 m2/s). The temperature of the surrounding air is 15°C, and the heat transfer coefficient on the fin surface is 30 W/m2 K. Assuming one-dimensional heat conduction along the fin, an adiabatic tip, and taking the nodal spacing to be Ax 3 cm, determine the tip temperature.
An uninsulated metal sphere with a diameter of 1 cm has a surface temperature of 30 °C, and is exposed to flow of water at 0 °C. The water moves in cross flow over the sphere with a velocity of 0.1 m/s. Determine the heat loss from the sphere.
The left end of a long glass rod, 10.0 cm in diameter, has a convex hemispherical surface 5.00 cm in radius. The refractive index of the glass is 1.60. Determine the position Sy of the image if an object is placed in air on the axis of the rod 4.00 cm from the left end of the rod. Express your answer in centimeters to three significant figures. Pa] ΑΣΦ ? cm 85 = 870 Submit Previous Answers Request Answer X...
3. A 20 cm diameter cooking is over a heater boiling water at 100°C. The bottom of the pan is 1 cm thick and the inside surface temperature of the bottom plate in contact with water is 110°C. determine the convective heat transfer coefficient of the boiling water. 'fthe ratcof heat trausfen is 500 watts
A 5-cm-diameter shaft rotates at 4500 rpm in a 15-cm long, 8-cm-outer-diameter cast iron bearing (k =70 W/m.K) with a uniform clearance of 0.6 mm filled wwith tubricating oil (u 0.03 N.s/m2 and k 0.14 W/m.K). The bearing is cooled externally by a liquid, and its outer surface is maintained at 40°C. Disregarding heat conduction through the shaft and assuming one- dimensional heat transfer, determine (a) the rate of heat transfer to the coolant, (b) the sutacs temperature of the...
3 3 3 O 2 The width or the rectangular enclosure is 30 cm and the height of the enclosure is 20 cm. The diameter of surface 1 is 1 cm. The center of surface 1 is 1 diameter above the bottom surface. 2. If in the above problem, surfaces 1, 2, and 3 are gray with £1 = 0.8, T1 = 2000 K, *2 = 0.9, T2 = 400 K, and €3 – 0.1, T3 = 350 K, what...
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