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Physical Chemistry
20 Feb 2007 16:07:25 IST
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13 Jun 2007 13:42:31 IST
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I think the answer of bhuvana89 is true.
Your question was: Why cant we have a free lunch.
BY LAW OF CONSERVATION OF ENERGY ,
*energy can neither be created nor destroyed but can only be
transformed from ONE FORM TO OTHER.
So, we cant have a free lunch , there is no work done there to get that lunch na.
Your question was: Why cant we have a free lunch.
BY LAW OF CONSERVATION OF ENERGY ,
*energy can neither be created nor destroyed but can only be
transformed from ONE FORM TO OTHER.
So, we cant have a free lunch , there is no work done there to get that lunch na.
22 Sep 2007 15:13:23 IST
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There are something like ten million million million million million million million million million million million million million million (1 with eighty zeroes after it) particles in the region of the universe that we can observe. Where did they all come from? The answer is that, in quantum theory, particles can be created out of energy in the form of particle/antiparticle parts. But that just raises the question of where the energy came from. The answer is that the total energy of the universe is exactly zero. The matter in the universe is made out of positive energy. However, the matter is all attracting itself by gravity. Two pieces of matter that are close to each other have less energy than the same two pieces a long way apart, because you have to expend energy to separate them against the gravitational force that is pulling them together. Thus in a sense, the gravitational field has negative energy. In the case of a universe that is approximately uniform in space, one can show that this negative gravitational energy exactly cancels the positive energy represented by the matter. So the total energy of the universe is zero.
Now twice zero is also zero. Thus the universe can double the amount of positive matter energy and also double the negative gravitational energy without violation of the conservation of energy.
It is said that there's no such thing as a free lunch. But the universe is the ultimate free lunch.
Now twice zero is also zero. Thus the universe can double the amount of positive matter energy and also double the negative gravitational energy without violation of the conservation of energy.
It is said that there's no such thing as a free lunch. But the universe is the ultimate free lunch.
22 Sep 2007 15:25:05 IST
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because if we dont do any work then our body wont need any energy through food so no lunch would be needed by us. and if we indeed do some work then we feel atleast a little bit hungry and then eat lunch. but then we have worked too so its not really a free lunch. that's the actual origin of the english phrase - "There is no such thing as a free lunch."
*PLZ RATE*
31 Jan 2008 23:59:04 IST
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when we eat food digestion of food occurs which is an exothermic process due to release of heat.even though we don't eat food from our own hands(jaise ki mummy khaana khila rahi hon) even then the HCl solution present in our liver has to neutralise the food salt i.e. NaCl.hence we can't have free lunch.aur waise bhi no one has noticed its written only lunch not dinner or breakfast so there has to be one more answer to this question.this is only one half.plz do rate for my efforts coz' i'm correct.
1 Feb 2008 00:37:59 IST
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arre yaar here lunch means meal.... lol no sense as why not breakfast or dinner... and waise what all of us have answered is correct... that total energy of a system is conserved so nothing is a free lunch, some energy has to go in to give some output in another form.
1 Feb 2008 01:14:48 IST
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To a scientist, TANSTAAFL(There Ain't No Such Thing As A Free Lunch) means that the system is ultimately closed -- there is no magic source of matter, energy, light, or indeed lunch, that cannot be eventually exhausted. Therefore the TANSTAAFL argument may also be applied to natural physical processes.(wiki)
1 Feb 2008 15:30:11 IST
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arre theres no reason behind it being called lunch!
lunch = luncheon = meal.....
and its a common phrase in english which scientists also claim is true... (using thermodynamics law of energy conservation)
thats what it says on wiki.. maybe ur sir gave u another plausible explanation too :)
lunch = luncheon = meal.....
and its a common phrase in english which scientists also claim is true... (using thermodynamics law of energy conservation)
thats what it says on wiki.. maybe ur sir gave u another plausible explanation too :)
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