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In an experiment of standing waves, a st...

In an experiment of standing waves, a string `90 cm` long is attached to the prong of an electrically driven tuning fork that scillates perpendicular to the length of the string at a frequency of `60 Hz`. The mass of the string is `0.044 kg`. What tension (in newton) must the string be under (weights are attached to the other end) if it is to oscillate in four loops?

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