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The average intensity of sunlight at the top of the earth's atmosphere in 1390 W/m². What is the maximum energy that a 21-mx 52-m
solar panel could collect in 2.1 hours in this sunlight?
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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 = 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 Tafter
a stainless steel cylinder is being subjected to induction heating, however, it is sought to insert a rod in the center, it is necessary to know the appropriate material of the rod since the material should not steal so much heat from the steel cylinder that will be subjected to induction heating. what is the appropriate material that the rod should be and why that material is being chosen?
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 Number
BIO Radiation from the head is a major source of heat loss from the human body. Model a head as a 20-cm-diameter, 20-cm-tall cylinder with a flat top. If the body’s surface temperature is what is the net rate of heat loss on a chilly day? All skin, regardless of color, is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.95.
High-intensity focused ultrasound (HIFU) is one treatment for certain types of cancer. During the procedure, a narrow beam of high-intensity ultrasound is focused on the tumor, raising its temperature to nearly 90°C and killing it. A range of frequencies and intensities can be used, but in one treatment a beam of frequency 4.40 MHz produced an intensity of 1425.0 W/cm. The energy was delivered in short pulses for a total time of 3.40 s over an area measuring 1.80 mm by 5.40 mm. The speed of sound in the soft tissue was 1580 m/s, and the density of that tissue was 1509.0 kg/m?. What was the wavelength A of the ultrasound beam? = m How much energy Eotal Was delivered to the tissue during the 3.40 s treatment? J Etotal = terms of use contact us help about us privacy polícy careers Show All V VS T.jpeg Free-Fall-Phet.docx free fall.png V VS T.jpeg FII F10 F8 F7 000 * F5 F6 aロ

Electronics and inhabitants of the International Space Station generate a significant amount of thermal energy that the station must get rid of. The only way that the station can exhaust thermal energy is by radiation, which it does using thin, 1.8-m-by-3.6-m panels that have a working temperature of about 6 °C and an emissivity of 0.85. Part A How much power is radiated from each panel? Assume that the panels are in the shade so that the absorbed radiation will be negligible. The temperature of deep space, which the panels face, is close to 0 K. Hint: Don't forget that the panels have two sides! Express your answer with the appropriate units. ► View Available Hint(s) P = Submit μA Value Previous Answers W .... ?
A person is standing outdoors in the shade where the temperature is 33 °C. 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 170 cm2 and its emissivity is 0.85.
A certain mass, m, of water has thermal energy added to it until the water is at the boiling point. Additional thermal energy is added until the entire mass, m, has been phased changed into steam. a) The temperature of the steam will be less than that of the water at the boiling point. b) The temperature of the steam will be greater than that of the water at the boiling point. c) The temperature of the steam will be the same as that of the water at the boiling point. d) The temperature of the steam will be zero. e) The temperature of the steam will be 2256000K.
What area is needed for a solar collector to absorb 45.0 kW ofpower from the Sun’s radiation if the collector is 75.0% efficient?(At the surface of Earth, sunlight has an average intensity of1.00 * 103W>m2.)
A 1200-kg car travels along a street at 18 î m/s. When it comes to an intersection, it does not stop and it collides with a 2500-kg truck travelling at 11 ĵ m/s. The car and the truck become completely entangled in the collision. a) What is the magnitude and direction of the velocity of the combined car and truck immediately after the collision? b) How much energy is converted into heat (and sound)?
A) Estimate the total solar heating absorbed by the Earth every second. Assume 36% of the incoming solar radiation is reflected by clouds and lost. You can assume that the Earth intercepts sunlight with an effective area of πr2 where r is Earth’s radius. B) Estimate the total heat lost by the Earth as infrared radiation every second. Assume Earth has an effective temperature of 252 K (-21 C).
A 5.50-kg black cat and her four black kittens, each with mass 0.800 kg, sleep snuggled together on a mat on a cool night, with their bodies forming a hemisphere. Assume the hemisphere has a surface temperature of 31.0°C, an emissivity of 0.970, and a uniform density of 990 kg/m3. Find(a) the radius of the hemisphere, (b) the area of its curved surface, (c) the radiated power emitted by the cats at their curved surface, and (d) the intensity of radiation at this surface. You may think of the emitted electromagnetic wave as having a single predominant frequency. Find (e) the amplitude of the electric field in the electromagnetic wave just outside the surface of the cozy pile and (f) the amplitude of the magnetic field.(g) What If? The next night, the kittens all sleep alone, curling up into separate hemispheres like their mother. Find the total radiated power of the family. (For simplicity, ignore the cats’ absorption of radiation from the environment.)