In a lecture demonstration of standing waves, a string is attachedto a tuning fork that vibrates at 60 Hz and sets up transversewaves of that frequency on the string. The other end of the stringpasses over a pulley, and the tension is varied by attachingweights to that end. The string has approximate nodes at the tuningfork and at the pulley.
(a) If the string has a linear mass density of 8.5 g/m and is 2.9 mlong (from the tuning fork to the pulley), what must the tension befor the string to vibrate in its fundamental mode?
N

(b) Find the tension necessary for the string to vibrate in itssecond, third, and fourth harmonic.
T2 = N
T3 = N
T4 = N

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Casey DurganLv2

24 Sep 2019

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