What area is needed for a solar collector to absorb 45.0 kW of power from the Sun's radiation if the collector is 75.0% efficient? (At the surface of Earth, 10³ W/m².) sunlight has an average intensity of 1.00×
Q: An electric immersion heater has a power rating of 1800 W. If the heater is placed in a 1.3 kg of…
A: Given data: Mass (m) = 1.3 kg Initial temperature (Ti) = 30°C Final temperature (Tf) = 100°C…
Q: b)A spherical infrared heater of radius 5.15 cm has an emissivity of 0.75. What temperature must it…
A: Spherical Infrared heater Radius, R = 5.15 cm = 0.0515 m e = 0.75
Q: Evaluate the intensity of solar radiation for 27 August 2020, given solar constant (Isc) =1800 W/m2.
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Q: A naked person whose body has a surface area of 1.40 m2 with an emissivity of 0.85 has a skin…
A: Given, Surface Area, A = 1.40 m2 Emissivity, e = 0.85 Skin temperature, T = 37°C = 310 K Room…
Q: A person eats a dessert that contains 280 Calories. (This "Calorie" unit, with a capital C, is the…
A: Given , skin temperature T1= 360C = 36+273 = 309 K Ambient temperature T2 = 240C = 24+273 = 297 K…
Q: What are the wavelengths of electromagnetic wave and sound wave of same frequency 1.9-kHz? Speed of…
A: Part(a):Frequency is Speed of electromagnetic wave is Speed of sound wave is Note:Find:Wavelength of…
Q: A lizard of mass 5.60 g is warming itself in the bright sunlight. It casts a shadow of 1.60 cm2 on a…
A: Given: mass of the Lizard m = 5.60 g area of the lizard shadow means lizards area A = 1.60 cm2 = 1.6…
Q: A community plans to build a facility to convert solar radiation to electrical power. The community…
A: Given, Required power = 2.6 MW Efficiency = 30% Intensity of sunlight = 1200W/m2 We need to…
Q: The radiant energy incident on the earth's surface on a sunny day is roughly 900 W/m2 . Collecting…
A: Given: The radiant energy rate I=900 Wm2 volume flow rate of air V.=1000 m3min=100060m3sec…
Q: A person of surface area 1.80 m2 is lying in the sunlight to get a tan. If the intensity of the…
A: The objective of the question is to find out the rate at which heat must be lost by the person in…
Q: The amount of radiant energy emitted by a surface is given by q = ɛ0 AT+ where q represents the rate…
A: Dimensional Analysis Dimensional Analysis is a method of studying the dimensions of complex physical…
Q: An incandescent light bulb with a surface area of 0.0136 m2 and an emissivity of 0.92 has a surface…
A: The net rate of radiation heat transfer between the bulb and the surroundings can be calculated…
Q: A spherical particle of density p= 5.00 O 5.8 x 10-5. as the Earth. Rsg = 1.5 x 10¹1 m. G= 6.67 x…
A: Density of particle = 5000 kg/m3Distance between particle and sun R= 1.5x1011 m
Q: The evaporation of perspiration is the primary mechanism for cooling the human body. Estimate the…
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Q: A person is standing outdoors in the shade where the temperature is 21 °C. (a) What is the radiant…
A: Stefan-Boltzmann law: States that the total energy per second radiated or observed by a black body…
Q: A high-energy pulsed laser emits a 1.1-ns-long pulse of average power 1.5×1011 W. The beam is nearly…
A: Time Power Radius Energy rms value of electric field
Q: A co-worker of mine was once installing sheet-styrofoam insulation in the walls of his new garage.…
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Q: Assume that the efficiency of the portable solar panel shown in the figure is 19%. (a)(a) What is…
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Q: An incandescent light bulb with a surface area of 0.0145 m2 and an emissivity of 0.87 has a surface…
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Q: The filament in a light bulb has a diameter of 0.02 mm and an emissivity of 1.0. The temperature of…
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- Engineering Application - A device called an insolation meter is used to measure the intensity of sunlight has an area of 100 cm2 and registers 6.50 W. What is the intensity in M/m2?A possible means of space flight is to place a perfectly reflecting aluminized sheet into orbit around the Earth and then use the light from the Sun to push this "solar sail." Suppose a sail of area A = 6.40 ✕ 105 m2 and mass m = 4,900 kg is placed in orbit facing the Sun. Ignore all gravitational effects and assume a solar intensity of 1,370 W/m2. A) If the solar sail were initially in Earth orbit at an altitude of 360 km, show that a sail of this mass density could not escape Earth's gravitational pull regardless of size. (Calculate the magnitude of the gravitational field in m/s2.) B) What would the mass density (in kg/m2) of the solar sail have to be for the solar sail to attain the same initial acceleration of 1193 µm/s2.A student is trying to decide what to wear. His bedroom is at 20°C. His skin temperature is 35°C. The area of his exposed skin is 1.50 m2. People of all races have skin that is dark in the infrared, with emissivity about 0.900. Find the net energy loss from his body by radiation in 10.0 min.
- The average intensity of solar radiation reaching Earth's satellite orbit is 1360 W/m?. A satellite's solar panel with area 37.7 m? directly faces the sun and absorbs the entire solar radiation incident on it. What is the force the solar radiation exerts on the panel (in Newton)? Speed of light in vacuum c = 3.008 m/s Permittivity of vacuum &0 = 8.85B-12 F/m Permeability of vacuum No = 1.26E-6 T•m/AIn an old house, the heating system uses radiators, which are hollow metal devices through which hot water or steam circulates. In one room the radiator has a dark color (emissitivity = 0.871). It has a temperature of 68.6 °C. The new owner of the house paints the radiator a lighter color (emissitivity = 0.497). Assuming that it emits the same radiant power as it did before being painted, what is the temperature (in degrees Celsius) of the newly painted radiator? Number i Original color Units Tbefore After painting TafterA family comes home from a long vacation with laundry to do and showers to take. The water heater has been turned off during vacation. If the water heater has a capacity of 51.3 gallons and a 4940 W heating element, how much time is required to raise the temperature of the water from 19.4°C to 63.3°C? Assume that the heater is well insulated and no water is withdrawn from the tank during this time.
- (b) The earth has a radius of R = 6.4 x 106 m. It orbits the sun in a nearly circular orbit at an average distance of r = 1.5x 10¹1 m. The solar intensity at the upper atmosphere is 1367 W/m². How much energy does the sun radiate per second?A person is standing outdoors in the shade where the temperature is 20 °C. (a) What is the radiant energy absorbed per second by his head when it is covered with hair? The surface area of the hair (assumed to be flat) is 160 cm² and its emissivity is 0.81. (b) What would be the radiant energy absorbed per second by the same person if he were bald and the emissivity of his head were 0.68?Problem: Radiation Related The energy flux associated with solar radiation incident on the outer surface of the earth's atmosphere has been accurately measured and is known to be 1,368 W/m^2. The diameters of the sun and earth are 1.39 X 10^9 and 1.27 x 10^7 m, respectively, and the distance between the sun and the earth is 1.5 × 10^11 m. (a) What is the emissive power of the sun? (b) Approximating the sun's surface as black, what is its temperature? (c) At what wavelength is the spectral emissive power of the sun a maximum? (d) Assuming the earth's surface to be black and the sun to be the only source of energy for the earth, estimate the earth's surface temperature.
- The Sun has a diameter of approximately 1.4 x 109 m and a surface temperature of about 5650 C. Assuming that the Sun radiates as a blackbody with emissivity of unity, calculate the power radiated by the Sun into the solar system, which you can assume is at the temperature of the microwave background radiation.0.863). It has a temperature of 67.0 °C. The new owner of the house paints the radiator a lighter color In an old house, the heating system uses radiators, which are hollow metal devices through which hot water or steam circulates. In one room the radiator has a dark color (emissitivity (emissitivity = 0.471). Assuming that it emits the same radiant power as it did before being painted, what is the temperature (in degrees Celsius) of the newly painted radiator? Tafter Tbefore After painting Original color Units NumberWhat is the rate of heat transfer by radiation from the skin of a person standing in a dark room whose ambient temperature is 22 °C ? The person has a normal skin temperature of 33 °C and a surface area of 1.50 m².The emissivity of skin is 0.97 in the infrared, the part of the spectrum where the radiation takes place.