A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28oC in an environment with a uniform temperature of 22o C. Calculate the heat loss rate if the skin temperature is raised by 8o C by vigorous exercise.

Q: n immersion heater of power 2500 W supplies energy to 3 kg of water at 25°C for 5 minutes The…

A: Given: The power of the immersion heater is 2500 W. The time interval is 5 min. The mass of the…

Q: The total power of the radiation emitted by the body is W. b. Suppose thir blaclch

A: Given,  Radius, R = 4.5 cm = 0.045 m  T = 293 K  Now,  According to the Steffen Boltzmann law, the…

Q: If the energy received by 6 m² area in 10 minutes is 3680 KJ. Calculate the value of Solar constant…

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Q: If the energy received by 4 m² area in 8 minutes is 2890KJ. Calculate the value of Solar constant ?

A: Given data :   Time   =  t   Area   =  A   Energy   =  E        To find :     Solar constant

Q: The operating temperature of a tungsten filament in an incandescent light bulb is 2500 KK, and its…

A: Given that:-Temperature, T=2500KEmissivity, e=0.350Power, P=200 WattStefan consatnt, σ=5.67×10-8…

Q: If the energy received by 3 m² area in 6 minutes is 3690KJ. Calculate the value of Solar constant ?

A: Given data :   Time  =   t   Area   =  A  Energy   =  E        To find :           Solar constant

Q: b) A spherical infrared heater of radius 6.2 cm has an emissivity of 0.78. What temperature must it…

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Q: A spherical surface of area 0.5m2, emissivity 0.85 and temperature 132°C is placed in a large,…

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Q: A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of…

A: Given:  Area, A = 2 m2  emmisivity, e = 0.97 Temperature of body, T = (28 + 8)o C = 36 o C  = 309 K…

Q: If 49% of the radiation that reaches the atmosphere is scattered or absorbed before reaching to the…

A: Given: Percentage of Sun's radiation reaching the atmosphere=49% The average albedo of the earth…

Q: If the energy received by 4 m² area in 10 minutes is 2120 KJ. Calculate the value of Solar constant…

A: Given data:  Area (A) = 4 m2 Time (t) = 10 minutes = 600 s Energy (E) = 2120 kJ = 2120×103 J…

Q: Determine the wavelength of the maximum amount of radiation emitted by surface at 49 °C. Express…

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Q: The operating temperature of a tungsten filament in an incandescent light bulb is 2500 KK, and its…

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Q: What is the rate of radiation from the filament? If the walls of the room in which the lamp operates…

A: 2) The filament’s radiation rate can be represented as, Here, σ, A, and T represent the…

Q: A cylindrical surface of radius 15 cm and length 2.4 m maintained at a temperature of 116°C is…

A: Given: The radius of the cylinder is 15 cm = 0.15 m. The length of the cylinder is 2.4 m. The…

Q: If the energy received by 5 m2 area in 10 minutes is 4200 kJ, calculate the value of solar constant.

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Q: What is the average energy contained in a 1.00 m3volume near the Earth’s surface due to radiant…

A: The expression for energy density stored in electric field as, u=12ε0E02 The equation for the…

Q: An aluminum rod with a mass of 80 kilograms at a length of 83.4 cm with a radius of 2.8mm has a…

A: Given: The mass of rod is m=80 kg. The length of rod is L=83.4 cm. The radius is r=2.8 mm. The…

Q: Heat is being supplied at a constant rate of 7.95 kW to 0.2 kg of liquid mercury. If its specific…

A: Given data: The amount of heat supplied to the mercury is Q=7.95 kW. The mass of the liquid mercury…

Q: Imagine choosing between two winter jackets. Assume you have access to a heat-generating mannequin…

A: Heat generation: The heat comes from the fact that all isotopes that can be used to make weapons are…

Q: In a foundry molten metal is stored in a large insulated crucible at 1800oC. To retain heat the…

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Q: Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.5, and surface temperature…

A: Heat flow takes place when there is a thermal gradient. One of the ways by which the heat flow is…

Q: An infrared heater for a sauna is operated at a power of {352} W and has an emissivity of {0.9}. If…

A: According to Stefan’s law, the power of emission (rate at which energy is emitted) from a source is…

Q: Thermal emission from forehead. Noncontact thermom- eters are used to quickly measure the…

A: The thermometer measures the temperature of the person by measuring the amount of radiation in the…

Q: Imagine choosing between two winter jackets. Assume you have access to a heat-generating mannequin…

A: Given: In order to generate a temperature difference (T), an insulation product must be placed…

Q: a thin square steel plate, 10cm on a side is heated in a blacksmith`s fotrge to a temperature  of…

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Q: A sphere of radius 4.3 mm is at 3499 K. Calculate the rate of radiation of energy (in W) by the…

A: Given: The radius of the sphere is 4.3 mm. The temperature is 3499 K. The emissivity is 1.

Q: If the energy received by 8 m² area in 14 minutes is 4600KJ. Calculate the value of Solar constant ?

A: Given data :   Energy  =  E   Area   =   A   Time   =  T          To find :         Solar constant

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: A bowl with 4.0 ꞏ102 g of water is placed in a microwave at 500 W and left for 22 minutes. How much…

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Q: The radiation energy (intensity of the radiation) reaching Earth from the sun at the top of the…

A: Assume R to be the radius of the Earth. The total energy E absorbed by the Earth due to the solar…

Q: Amount of solar energy received on the earth's surface per unit area per unit time is defined a…

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Q: A spherical surface of area 0.6m2, emissivity 0.86 and temperature 112°C is placed in a large,…

A: (a) Area, A = 0.6 m2 emissivity, e = 0.86 T = 112°C = 385 K  Stefan's constant σ = 5.67 x 10-8…

Q: A radiant heating lamp has a surface temperature of 1000 K with ε = 0.8. How large a surface area is…

A: Q = εσAT^4A = .Q/(εσT4) = 250/(0.8 × 5.67 × 10-8 × 10004)= 0.0055 m2.