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Aug. 28th, 2010 08:34 pm"When you hold someone in your arms, the good feeling is you feel the body heat. That's the infra-red radiation, that radiates at about 100 Joules per second. 100 watts. An electric blanket is only 50 watts. So a partner is about twice as effective as an electric blanket. Maybe also more fun."
"If you ever work on your car, make sure that you never drop accidentally the wrench that you're using onto the battery - because if you did then, inside the battery, about 6 kilowatts - 6000 joules per second - are going to be produced in terms of heat, and the sulfuric acid is going to boil, the case may melt, and that's no good. Not only is that stupid, but it's also very dangerous. So let's do it."
"I'm going to short out that battery, and as I do that, you will clearly see that the battery doesn't like it. I will be very careful not to hold on to this wrench too long, because it would weld onto it, actually, it can weld on to it and stay there, the current is so high, it can go up to 600 amperes, that it can weld onto it, and then you can't get it off any more.
In case that happens, I will walk out of here. And I advise you to do the same."
Prof. Walter Lewin FTW.
"If you ever work on your car, make sure that you never drop accidentally the wrench that you're using onto the battery - because if you did then, inside the battery, about 6 kilowatts - 6000 joules per second - are going to be produced in terms of heat, and the sulfuric acid is going to boil, the case may melt, and that's no good. Not only is that stupid, but it's also very dangerous. So let's do it."
"I'm going to short out that battery, and as I do that, you will clearly see that the battery doesn't like it. I will be very careful not to hold on to this wrench too long, because it would weld onto it, actually, it can weld on to it and stay there, the current is so high, it can go up to 600 amperes, that it can weld onto it, and then you can't get it off any more.
In case that happens, I will walk out of here. And I advise you to do the same."
Prof. Walter Lewin FTW.
