November 2007
Intermediate to advanced
736 pages
46h 32m
English
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FORCED VIBRATIONS
When a vibrating tuning fork is held close to the ear the sound is heard quite loudly but the loudness falls off rapidly as the fork is moved away. Since the prongs are of very small area, we may regard the fork as an approximate point source of energy, and allowing for attenuation the loudness of the sound is inversely proportional to the square of the distance from the source. In this respect a point source of sound may be compared with a point source of electromagnetic waves. Both obey an inverse square law.
If, however, the stem of the fork is pressed against a table top, the sound can be heard clearly all over the room. Under these conditions the table is set into forced vibrations and then acts as a large extended source. ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.