Astronomy for Schools And Colleges
Astronomy for Schools And Colleges
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In our eReader you can find the full English version of the book. Read Astronomy for Schools And Colleges Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Astronomy for Schools And Colleges
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Every one knows that he can hold his hand for some time in air at the temperature of boiling water. The rarer the air the higher the temperature the hand would bear without injury. In an atmosphere as rare as ours at the height of 50 miles, it is probable that the hand could be held for an indefinite period, though its temperature should be that of red-hot iron ; hence the meteor is not consumed so rap- idly as if it struck a dense atmosphere with planetary CA USE OF METEORS. 379 velocity. In t...he latter case it would probably disappear like a flash of lightning.
(3. ) The amount of heat evolved is measured not by that which would result from the combustion of the body, but by the vis viva (energy of motion) which the body loses in the atmosphere. The student of physics knows that mo- tion, when lost, is changed into a definite amount of heat. If we calculate the amount of heat which is equiv- alent to the energy of motion of a pebble having a veloc- ity of 20 miles a second, we shall find it sufficient to raise about 1300 times the pebble's weight of water from the freezing to the boiling point.
What to read after Astronomy for Schools And Colleges?
You can find similar books in the "Read Also" column, or choose other free books by Newcomb Simon to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Every one knows that he can hold his hand for some time in air at the temperature of boiling water. The rarer the air the higher the temperature the hand would bear without injury. In an atmosphere as rare as ours at the height of 50 miles, it is probable that the hand could be held for an indefinite period, though its temperature should be that of red-hot iron ; hence the meteor is not consumed so rap- idly as if it struck a dense atmosphere with planetary CA USE OF METEORS. 379 velocity. In t...he latter case it would probably disappear like a flash of lightning.
(3. ) The amount of heat evolved is measured not by that which would result from the combustion of the body, but by the vis viva (energy of motion) which the body loses in the atmosphere. The student of physics knows that mo- tion, when lost, is changed into a definite amount of heat. If we calculate the amount of heat which is equiv- alent to the energy of motion of a pebble having a veloc- ity of 20 miles a second, we shall find it sufficient to raise about 1300 times the pebble's weight of water from the freezing to the boiling point.
What to read after Astronomy for Schools And Colleges?
You can find similar books in the "Read Also" column, or choose other free books by Newcomb Simon to read onlineMoreLess
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