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- Path: sparky!uunet!portal!cup.portal.com!Eric_S_Klien
- From: Eric_S_Klien@cup.portal.com
- Newsgroups: sci.physics
- Subject: Re: Units (was Re: E=MC^2)
- Message-ID: <65184@cup.portal.com>
- Date: Thu, 3 Sep 92 01:43:04 PDT
- Organization: The Portal System (TM)
- Distribution: world
- References: <64995@cup.portal.com> <BtuHLD.L53@ux1.cso.uiuc.edu>
- <mcirvin.715297106@husc8>
- Lines: 17
-
- The best answer that I have received to my translation of one gram of
- matter into energy is the following:
-
- " The "c" in E=mc^2 is the speed of light in the vaccum, which is
- the same everywhere and always (hence c, for Constant). It is, near
- enough, 3e8 (i.e. 300,000,000) meters per second, so c^2 is 9e16
- meters squared per seconds squared. Those are funny units, but when
- multiplied by mass they give units of energy. If the mass is one
- gram, the energy is (1e-3 kilograms) x (9e16 m^2/sec^2)= 9e13 Joules
-
- One kilowatt-hour (the thing the power company charges you 4 cents
- for) is 3.6e6 Joules, so this is (9e13 Joules) / (3.6e6 Joules/kw-h)
- = 2.5e7 kW-hr, i.e. 25 million kilowatt-hours. Happy now?"
-
- Can anyone convert this into energy of sticks of TNT?
-
- Eric Klien
-