Physics question, ...machines... |
 Feb 10 2005, 06:16 PM
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#1
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 Shove it  Group: Member Posts: 496 Joined: Jan 2005 Member No: 91,641  |
On a recent Physics quiz we had this question:
"True or False: An ideal machine will have an efficiency greater than 100%" Now, my teacher was trying to see whether or not we knew that the energy you put into a machine will be equal to or less than the energy coming out of the machine. I got the answer right. However, a few people in my class are arguing that it was an unfair question because an ideal machine would have an efficiency greater than 100%. We think that my teacher should just omit the question because it can go either way. Would you answer true or false? |
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| *wind&fire* |
Feb 18 2005, 11:21 PM
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#2
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Guest |
it cant even get up to 100%
Lenz's law states that the induced current always causes a motor effect, which opposes the original flux change that caused the generator effect... in other words when the motor effect is in place there will always be an opposing force... |
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Posts in this topic
Heewee Physics question Feb 10 2005, 06:16 PM
omg_melface I'd circle both the answers. =] Feb 10 2005, 06:18 PM Heewee Smartass
Our quizzes are on scantrons anyway s... Feb 10 2005, 06:20 PM omg_melface I'd circle a and b. Feb 10 2005, 10:39 PM x_angawhomps Hey Hillary! Hilary?
Ahem. I'd bubble-in... Feb 10 2005, 10:41 PM smilz2dasun *gasp* your name is hillary too?!
um.. i can... Feb 11 2005, 12:03 AM someflipguy A machine is only as efficient as the human that m... Feb 11 2005, 10:00 AM wind&fire thats impossible to exceed 100% efficiency since t... Feb 12 2005, 03:09 AM mysticalazxn i dunno
i took physic AP in high school. and we ne... Feb 12 2005, 05:27 PM AngelicEyz00 I'd pick false. My guess, is, ideally, I'd... Feb 12 2005, 08:10 PM lAzN YiN YanGl If it could go more, then wouldn't that cause ... Feb 18 2005, 09:38 PM
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