A box is suspended by a steel wire via a frictionless pulley

The wire has a mass per length of µ = 24.5 × 10 − 3 kg/m.
The box is so heavy and the wire so thin that the mass of the wire does not influence the wire tension.
The horizontal part of the wire has a length l = 1 m and it is observed that the lowest frequency for standing waves on this part is f1 = 29.6 Hz.

What is the mass M of the box?

1 answer

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