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- Path: sparky!uunet!dziuxsolim.rutgers.edu!pilot.njin.net!jmgreen
- From: jmgreen@pilot.njin.net (Jim Green)
- Newsgroups: sci.physics
- Subject: Question 6
- Message-ID: <Jan.2.19.47.51.1993.14346@pilot.njin.net>
- Date: 3 Jan 93 00:47:52 GMT
- Organization: Rutgers Univ., New Brunswick, N.J.
- Lines: 39
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- Qustion 6:
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- If a Bunsen burner is used to melt an iceberg, the internal energy
- of the iceberg (now water) increases, U = mLf (plus perhaps U = mcdT).
- But the mass of the berg (now water) has also increased, E = mc2!
- That is to say that mass and energy are the same thing, ie both the
- mass and energy increase.
-
- On the other hand, if a positron and an electron collide (say while
- traveling slow), the mass goes to zero and the energy increases,
- E = hbarnu.
-
- I don't understand this!
-
- Well, you say, in the case of the anihilation, the mass-energy doesn't
- change. Why, yes that is true, it does look like mass is "converted"
- to energy and mass-energy is conserved, but in the case of the iceberg
- BOTH the mass AND the energy increase by the SAME amount of heat, that
- done to the berg by the burner, and mass energy is NOT conserved!
-
- Comments??
-
- Best Wishes for a Happy New Year, Jim Green
- --
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