15.14 A wire stretched between two rigid supports vibrates in its fundamental mode with a frequency of 45 Hz. The mass of the wire is 3.5 × 10–2 kg and its linear mass density is 4.0 × 10–2 kg m–1. What is (a) the speed of a transverse wave on the string (b) the tension in the string?
15.14 A wire stretched between two rigid supports vibrates in its fundamental mode with a frequency of 45 Hz. The mass of the wire is 3.5 × 10–2 kg and its linear mass density is 4.0 × 10–2 kg m–1. What is (a) the speed of a transverse wave on the string (b) the tension in the string?
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1 Answer
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Mass of the wire, m = 3.5 kg
Linear mass density, = 4 kg/m
Frequency of vibration, = 45 Hz
Length of the wire, l = = = 0.875 m
The wavelength of the stationary wave = , where n = number of nodes in the wire
For fundamental node, n = 1, = 2l = 2
(a) The speed of the transverse wave in the string is given as v = = 45 = 78.75 m/s
(b) The tension produced in the string is given by the relation, T = = 4 = 248.06 N
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