In an acoustics experiment, a piano string with a mass of 5.00 g and a length of 70.0 cm is held under tension by running the string over a frictionless pulley and hanging a 250.-kg weight from it. The whole system is placed in an elevator.
a) What is the fundamental frequency of oscillation for the string when the elevator is at rest?
b) With what acceleration and in what direction (up or down) should the elevator move for the string to produce the proper frequency of 440. Hz, corresponding to middle A?
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