- ...act
- The only two classes of such forces are
electromagnetic and gravitational. We do not consider electromagnetic
forces. Also, the effects of the gravitational forces will be
negligible compared to the tension forces so long as the string is
sufficiently light (32#32 is small) or the tension sufficiently large
(11#11 large). This holds whenever the the string hangs between the
walls without sagging.
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- ...air
- We also ignore air resistance
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- ...equal
- Tensions are only equal for
massless strings.
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- ...40#40
- In the figure, the segment may appear to
have a length significantly longer than 40#40. This is because we
have exaggerated the amplitude of the involved wave for clarity.
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