> You are designing a solar car with a total roof area for solar cells of 6.4m2. Calculate the electrical power available, assuming total cell efficiency of 17% and a constant light intensity of 980 W/ m².
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A: Given: Intensity, I =700 W/m2 Area, A = 0.5 m2 time, t = 4 h
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Q: You are designing a solar car with a total roof area for solar cells of 6.4m². Calculate the…
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Q: The average intensity of sunlight on Earth’s surface is about 700 W/m2. (a) Calculate the amount of…
A: Average intensity = 700 W/m2 Area, A = 0.5 m2 time, t = 4 h
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A: Given:Average intensity = 700 W/m2Efficiency =10%Intensity = 700 W/m2 (10%)Power = 100 W
Q: The average intensity of sunlight on Earth’s surface is about 700 W/m2 . (a) Calculate the amount…
A: Intensity, I = 700 W/m2 Area, A = 0.5 m2 time, t = 4 h = 4 x 3600 s
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A: Given: Power = 100 W Efficiency e = 10% Intensity = 70 Wm2 Formula used: I=PA here, A is the area. E…
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- In Washington, a solar panel facing south angled at 15 degrees receives 0.5 (+/- 0.5) kWh/m^2/day in the winter. Solar panels are 20% efficient. Another 20% of power is lost due to heat. A house uses 45 kW per day in the winter. What is the minimum number of panels needed?you are standing 2.5 m from a 150-W lightbulb. If the pupil of your eye is a circle 5.0 mm diameter, how much energy enters your eye per second? (assume 5.0% of the lightbulb's power is converted to light)Question 7: Certain areas in Arizona, Nevada, California and Texas can have up to 4000 sunny hours a year. The fact that these vast lands are less populated and agriculturally not suitable makes them ideal for solar power plants. Though most commercial solar panels have efficiencies from 15% to 20%, researchers have now developed solar cells with efficiencies approaching 50%. If you are asked to plant a solar energy system in these areas using the newest technology, how much land do you need to produce enough energy for the US. Make the conservative assumptions that the average light energy landing to the Earth' surface is 1.0 cal/(cm2 min). An estimate for the US energy consumption by major sources is given below. U.S. primary energy consumption by major sources, 1950-2019 quadrillion British thermal units 110 100 90 80 70 60 50 40 30 20 10 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 renewables nuclear petroleum natural gas coal
- 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, sunlight has an average intensity of 1.00 × 10³ W/m².)A solid specimen of dielectric has a dielectric constant of 4 and tan delta=0.0001 at a frequency of 60 Hz. If it is subjected to an alternating field of 100 kV/cm, calculate the heat generated in the specimen due to the dielectric loss.An incandescent lightbulb is an inexpensive but highly inefficient device that converts electrical energy into light. It converts about 10 percent of the electrical energy it consumes into light while converting the remaining 90 percent into heat. The glass bulb of the lamp heats up very quickly as a result of absorbing all that heat and dissipating it to the surroundings by convection and radiation. Consider an 8-cm-diameter 60-W lightbulb in a room at 25°C. The emissivity of the glass is 0.9. Assuming that 10 percent of the energy passes through the glass bulb as light with negligible absorption and the rest of the energy is absorbed and dissipated by the bulb itself by natural convection and radiation, determine the equilibrium temperature of the glass bulb. Assume the interior surfaces of the room to be at room temperature.
- In a sunnier location than Eugene, the sun shines for an average of 2000 hours per year. A home owner installs solar panels that generate 3.5 kW from these panels when the sun is shining. If the local electric utility charges $0.15 per kWh, how much money do the solar panels save the home owner per year? Give the answer to the nearest dollar.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.In a particular area of the country, electrical energy costs $0.18 per kilowatt-hour. (Round your answers, in dollars, to at least two decimal places.) (a) How much does it cost to operate an old-style incandescent 60.0-W light bulb continuously for 24 hours? $ (b) A modern LED light bulb that emits as much visible light as a 60.0-W incandescent only draws 8.50 W of power. How much does it cost to operate this bulb for 24 hours? $ (c) A particular electric oven requires a potential difference of 220 V and draws 20.0 A of current when operating. How much does it cost to operate the oven for 3.90 hours? $
- A 6 MW generator had a thrust of 103,000 lb. The outside diameter of the step bearing is 12 in, and the inside diameter is 8 in. Employ a film thickness of 0.004 in. Use SAE 20 oil at 120, the specific heat of the oil being 0.6 BTU/lb deg F, and density of 0.307 Ib/cu. in • Determine: (b) Frictional lossA UV lamp used to disinfect objects emits radiation with an rms electric field strength of 31 N/C. Calculate the energy absorbed by a circular target of radius 3 cm that is placed under the lamp for 310 seconds.(Give your answer in joules)The evaporation of perspiration is the primary mechanism for cooling the human body. Estimate the amount of water you will lose when you bake in the sun on the beach for an hour. Use a value of 1 000 W/m2 for the intensity of sunlight and note that the energy required to evaporate a liquid at a particular temperature is approximately equal to the sum of the energy required to raise its temperature to the boiling point and the latent heat of vaporization (determined at the boiling point)