Physics, 17.07.2019 21:10 ninjapig647
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. they initially cost much more, but last far longer and use much less electricity. according to one study of these bulbs, a compact bulb that produces as much light as a 100 w incandescent bulb uses only 23.0 w of power. the compact bulb lasts 1.00Ă104 hours, on the average, and costs $ 12.0 , whereas the incandescent bulb costs only 76.0 ¢, but lasts just 750 hours. the study assumed that electricity cost 8.00 ¢ per kwh and that the bulbs were on for 4.0 h per day.
(a) what is the total cost (including the price of the bulbs) to run each type of bulb for 3 years?
(b) how much do you save over 3 years if youuse a compact fluorescent bulb? (donât forget that compact bulbs should not be thrown out in the trash but recycled! )
c) what is the resistance of a â100wâ fluorescent bulb? (remember the actual rating is only 23w of power for a 120v circuit)
Answers: 1
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The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?
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In the nineteenth century, gregor mendel first determined some basic rules of genetics that have been observed throughout all types of life. no observations have disproved these basic rules of genetics. charles darwin developed the idea of biological evolution around the same time, but he was unaware of mendelâs discoveries in genetics. over a century later, darwinâs idea of evolution was modified in order to incorporate mendelâs rules of genetics along with the other evidence that darwin had used. what is most likely the relationship between mendelâs rules of genetics and darwinâs idea of biological evolution? a.)mendelâs genetics states laws that are now part of the theory of biological evolution.b.)biological evolution states laws that are part of mendelâs theory of genetics.c.)mendelâs genetics replaced darwinâs entire concept of biological evolution.d.)biological evolution is a law that explains why all genetics exist.
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Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent...
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