. The filament of an evacuated light bulb has a length of 20 cm, diameter 0.3 mm, emissivity 0.2, calculate the power it radiates at 2000°K. (Stefan's constant o = 5.67 x 10-8 W/m² K4)
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Q: The filament of a 75-W light bulb is at a temperature of 4,150 K. Assuming the filament has an…
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Q: Consider a car radiator at 115°C in a 50.5°C environment and the exchange of heat between them by…
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Q: A rubber ball of radius 1.72 m and emissivity 0.940 is heated to 128°C. HINT (a) Convert the given…
A: Given values - Radius =r =1.72 mEmissivity=e=0.940Temperature=T1=128oC
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Q: b) A spherical infrared heater of radius 5.8 cm has an emissivity of 0.84. What temperature must it…
A: Radius , R = 5.8 cm = 5.8 x 10-2 m emissivity , e = 0.84 P = 0.52 kW = 520 W To find = Temperature…
Q: onsider a car radiator at 110.5°C in a 50.5°C environment and the exchange of heat between them by…
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Q: 20. Go Light bulb 1 operates with a filament temperature of 2700 K, whereas light bulb 2 has a…
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A: at T=950 length L0=6.2m coefficient of thermal expansion α=1.2×10-6 m/deg we know…
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A: heat loss=σeAT⁴
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Q: A body of surface area 10 cm² and temperature 727°C emits 300 J of energy per minute. Find its…
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Q: A granite ball of diameter 4.5 m and emissivity 0.455 is heated to 131°C. (a) What is the surface…
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Q: Light bulb 1 operates with a filament temperature of 2900 K, whereas light bulb 2 has a filament…
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Q: 21. ssm The amount of radiant power produced by the sun is approxi- mately 3.9 × 1026 W. Assuming…
A: Given: Amount of power radiated = 3.9 x 1026 W The radius of the sun = 6.96 x 108 m Surface…
Q: Hot air at 80 °C is blown over a 2 - m * 4 - m flat surface at 30 °C. If the average convection he…
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Q: A cylindrical surface of radius 57 cm and length 1.2 m maintained at a temperature of 142°C is…
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Q: At what net rate does heat radiate from a 275-m2 black roof on a night when the roof's temperature…
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Q: A gold statue with surface area 0.81 m2 and emissivity 0.04 is placed in a vault. The temperature of…
A: The net power of radiational heat loss from the statue is given by…
Q: Consider a 260-m2 black roof on a night when the roof’s temperature is 27.5°C and the surrounding…
A: The rate at which heat radiates is calculated by using the formula P=σeATs4-T4 , where σ=5.67×10-8…
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