the filament of a light bulb goes from a temperature of about 400K up to 5000K, when it is turned on. How many times more radiant energy does it emit when it is on than when it is off?
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the filament of a light bulb goes from a temperature of about 400K up to 5000K, when it is turned on. How many times more radiant energy does it emit when it is on than when it is off?
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- 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)In a particular town, electrical energy costs $0.12 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 100-W light bulb continuously for 24 hours? $ (b) A modern LED light bulb that emits as much visible light as a 100-W incandescent only draws 16.0 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 4.80 hours? $(1) An incandescent light bulb produces 5.85 Joules of light energy each second. This bulb is 7.80% efficient, meaning that only 7.80% the total energy it consumes becomes light and the rest becomes waste heat. A 12.0 W fluorescent bulb is designed to produce the same illumination (in Joules of light energy per second) as the incandescent bulb. A large building uses 17,530 light bulbs. At a cost of 8.56€/kW-hr for electricity, how much money will the owners of the building save each year if they use fluorescent bulbs instead of incandescent bulbs? Express your answer in dollars. [answer: about $828,000]
- 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 coalConsider a 1000-W iron whose base plate is made of 0.5-cm-thick aluminum alloy 2024-T6 (r = 2770 kg/m3 and cp = 875 J/kg·°C). The base plate has a surface area of 0.03 m2. Initially, the iron is in thermal equilibrium with the ambient air at 22°C. Assuming 90 percent of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°C.What percentage of the power is lost in the power lines if the temperature of the wire is 23.3oC?
- A 2.1-m-long, 0.2-cm-diameter electrical wire extends across a room that is maintained at 20°C. Heat is generated in the wire as a result of resistance heating, and the surface temperature of the wire is measured to be 180°C in steady operation. Also, the voltage drop and electric current through the wire are measured to be 110 V and 3 A, respectively. Disregarding any heat transfer by radiation, determine the convection heat transfer coefficient for heat transfer between the outer surface of the wire and the air in the room.A coil connected to a 220 V line is used to heat 600 g of water at 30.0 C. It is found out that after 5 mins, the temperature of water increased by 60.0°C. How much calories of heat are produced by the coil assuming that all the heat goes to water? O 36,000 O 150,480 O 75,240 18,000A solar panel of length L and width W produces 28.4 kWh in a day. Under the same conditions (i.e. the same amount of solar energy available and the same efficiency) a solar panel of length 2L and width 2W would produce how many kWh in a day? Round off your answer to 2 decimal places, but do not write the unit.
- An electric light bulb rated at 100 W is left on for 10 days and nights. (a) How much energy was expended? (b) How long must an electric heater rated 3500 W be left on to expend the same amount of energy?What is the useful energy output when a 60 W light bulb is on for 2 hours?Recall, traditional light bulbs are only 5% efficient.How much time is needed for a surgical cauterizer to raise the temperature of 1.00 g of tissue from 37.0ºC to 100ºC and then boil away 0.500 g of water, if it puts out 2.00 mA at 15.0 kV? Ignore heat transfer to the surroundings. How do I check my work for this probelm?