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A 60-Watt bulb illuminates a surface a distance d away with an illuminance of 2400 lux. What would be the illuminance on a surface a distance 2d away (i. e. twice as far away) when illuminated by a 30-Watt bulb?
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Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.
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Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?
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A 60-Watt bulb illuminates a surface a distance d away with an illuminance of 2400 lux. What would b...
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