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From the page: "1547. If I were to heat up a brownie and a white piece of cake, would the brownie heat up faster by radiation transfer because of its darker color? â€" B In principle, the brownie would heat up faster by radiation in a hot environment and cool off faster by radiation in... more
Reviewed by prncssgrl Nov 30 2007, 01:32pm ( 102 reviews ) • virginia.edu
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Rated by WilliamStafford9 on Oct 17 2008, 6:43pm
Nice reference for students, teachers, parents, decision-makers, etc.
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Rated by A-Za-z0-9 on Oct 08 2008, 1:59pm
From the page: "Metals are good conductors of electricity and effectively "short out" any electric fields that are parallel to their surfaces. Microwaves reflect from the metal walls because those walls force the electric fields of the microwaves to cancel parallel to their surfaces and that necessitates a reflected wave to cancel the incident wave. Because of that cancellation at the conducting surfaces, the intensity of the microwaves at the walls is zero or very close to zero. The ant survived by staying within a tiny fraction of the microwave wavelength (about 12.4 cm) of the metal surfaces, where there is almost zero microwave intensity. Had the ant ventured out onto your cup, it would have walked into real trouble. Once exposed to the full intensity of the microwaves, it would not have fared so well." Well, I never knew that ;)
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Rated by Qoehoe on Jul 28 2008, 3:06pm
Very interesting service.
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Rated by coz752 on May 21 2008, 12:29pm
science questions, English answers
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Reviewed by contactcollins on May 16 2008, 4:17pm
Esoteric collection of physics facts with a bizarre microwave oven fixation
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Rated by parhamreza on May 13 2008, 2:21am
What a great website. I love it.
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Rated by DeepBlueMe on May 03 2008, 11:04pm
What does it mean if a light bulb uses 60 watts? -- B, Los Angeles The watt is a unit of power, equivalent to the joule-per-second. One joule is about the amount of energy it takes to raise a 12 ounce can of soda 1 foot. A 60 watt lightbulb uses 60 joules-per-second, so the power it consumes could raise a 24-can case of soda 2.5 feet each second. Most tables are about 2.5 feet above the floor. Next time you leave a 60-watt lightbulb burning while you're not in the room, imagine how tired you'd get lifting one case of soda onto a table every second for an hour or two. That's the mechanical effort required at the generating plant to provide the 60-watts of power you're wasting. If don't need the light, turn off lightbulb!
