typical person has a surface area of about 1.4 m^2, and an average sin temperature of 33 degrees Celsius. Determine the net power radiated per unit area if the person’s total emissivity is 97 % and the environment is at room temperature 20 degrees C. How much energy does that body radiate per second
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A typical person has a surface area of about 1.4 m^2, and an average sin temperature of 33 degrees Celsius. Determine the net power radiated per unit area if the person’s total emissivity is 97 % and the environment is at room temperature 20 degrees C. How much energy does that body radiate per second?
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- An incandescent light bulb with a surface area of 0.0121 m2 and an emissivity of 0.95 has a surface temperature of 181.9°C. If the temperature of the surroundings are 20.3°C, what is the net rate of radiation heat transfer between the bulb and the surroundings? [round your final answer to one decimal place]? {σ = 5.6704 x 10-8 W/(m2∙K4)}The next four questions use this description. Our Sun has a peak emission wavelength of about 500 nm and a radius of about 700,000 km. Your dark-adapted eye has a pupil diameter of about 7 mm and can detect light intensity down to about 1.5 x 10-11 W/m2. Assume the emissivity of the Sun is equal to 1. First, given these numbers, what is the surface temperature of the Sun in Kelvin to 3 significant digits? What is the power output of the Sun in moles of watts? (in other words, take the number of watts and divide it by Avogadro's number) Assuming that all of the Sun's power is given off as 500 nm photons*, how many photons are given off by the Sun every second? Report your answer to the nearest power of 10 (e.g. if you got 7 x 1024, give your answer as 25).What is the net heat current in radiation of an Ice cube at 0 °C if the surrounding air is at 20°C? The ice cube has sides of length 2.50 cm, the emissivity of ice is 0.96 and the Stefan-Boltzmann constant is o = 5.67 x 10-8 Watts/m2Kª. Is the heat flow out or into the ice cube, explain?
- Please asapDi O 11:PA (1) Suppose a person is covered head to foot by wool clothing with average thickness of 2 cm and is transferring energy of 6000 joules by conduction through the clothing for 2 minutes. What is the temperature difference across the clothing, given the surface area is 1.4m?? (Given: Thermal conductivity of wool is 0.04 W/mK) The difference in temperature = (2) A 9.15 kg sample of water at 11°C is in a calorimeter. You drop a piece of iron with a mass of 0.41 kg at 260°C into it. After the sizzling subsides, what is the final equilibrium temperature? (Given: Sp. Heat of water 1cal/g°C & Sp. Heat of iron is 0.106 cal/g°C) Equilibrium temperature in celcius =Calculate the amount of radiation emitted for a unit surface (1 m²) for the following situations. Express your answers in both SI units (in W) and U.S. Customary units (in Btu/h). (a) a hot pavement in Arizona at 52°C (125.6°F) and & ≈ 0.84 rate in W rate in Btu/h W Btu/h (b) a hood of a car at 44°C (111.2°F) and & ≈ 0.91 rate in W W rate in Btu/h Btu/h (c) a sunbather at 38°C (100.4°F) and & ≈ 0.91 rate in W W rate in Btu/h Btu/h