A solid sphere with radius 3.50 cm is suspended within a large, evacuated enclosure whose walls are at 300.0 K. A power input of 4500.0 W is required to maintain the sphere at 3000.0 K. If heat conduction along the supports is ignored, what is the emissivity of the sphere? (no units) Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: Answer x10
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- The emissivity of tungsten is 0.35. A tungsten sphere with radius 1.61 cm is suspended within a large evacuated enclosure whose walls are at 300 K. What power input (in W) is required to maintain the sphere at a temperature of 3029 K if heat conduction along the supports is neglected? Round your answer to 2 decimal places.A ceramic ball of radius 2.52 m and emissivity 0.900 is heated to 123°C. (a) Convert the given temperature to Kelvin. (Enter your answer to at least three significant figures.) K (b) What is the surface area (in m2) of the ball? m2 (c) If the ambient temperature is 26.0°C, what net power (in W) does the ball radiate? WWhat is the total heating load (in watt) for a lecture auditorium with a room temperature 24 C holding 180 students? The average body surface area of each student is 1.8 m2 and they are seated and reading. How many kg of moisture will be produced in one hour if 40% of the total heat is latent heat?
- A ceramic heater element is 30.5 cm by 10.2 cm by 5 cm. It is rated at 1500 W and emissivity of .68. The surrounding area is at 20 0C. What is the temperature of the element?An orange orb has an emissivity of 0.405 and its surroundings are at 324°C. The orange orb is absorbing heat via radiation at a rate of 640 W and it is emitting heat via radiation at a rate of 84 W. Determine the surface area of the orb, the temperature of the orb, & Pnet.A granite ball of radius 0.6m and emissivity 0.450 is heated to 370K. a) what is the surface area of the ball? b) if the ambient temperature is 291 K, what net power does the ball radiate?
- A toaster heater is heated up to a temperature of 584 degrees C. The emissivity of the toaster heater is 0.5 and it has an area of 5 x 10-3 m². The toaster is in the kitchen, which has an air temperature of 23 degrees C. What is the net power lost by the toaster heater?The robot HooRU is lost in space, floating around aimlessly, and radiates heat into the depths of the cosmos at the rate of 14.9 W. HOORU's surface area is 1.51 m2 and the emissivity of its surface is 0.217. Ignoring the radiation that HooRU absorbs from the cold universe, what is HOORU's temperature T? т K IIAn orange orb has a surface area of 6.1 m2 and its surroundings are at 216°C. The orange orb is absorbing heat via radiation at a rate of 510 W and it is emitting heat via radiation at a rate of 661 W. Determine the emissivity of the orb, the temperature of the orb, & Pnet.
- To keep yourself warm in the winter, you heat a solid metal ball and place it on a stand in the center of your room. The ball has a radius of 17.0 cm and an emissivity of 0.830. If your room has a temperature of 15°C, what is the net power radiated by the ball initially, when the ball's temperature is 200°C?Heat pumps can be used as a practical way of heating buildings. The ground itself can be used as the cold source because at a depth of a few metres the temperature is independent of the air temperature; in temperate latitudes the ground temperature is around 13 °C at a depth of 10 m. On a cold day it is found that to keep a certain room at 18 °C a heater rated at 5 kW is required. Assuming that an ideal heat pump is used, and that all heat transfers are reversible, calculate the power needed to maintain the room temperature. Recall that 1 W = 1 J s−1.A granite ball of radius 9.00 m and emissivity 0.046 is heated to 150°C. (a) Convert the given temperature to Kelvin. (Enter your answer to at least the nearest Kelvin.) K (b) What is the surface area of the ball? m2 (c) If the ambient temperature is 25.0°C, what net power does the ball radiate? W