Two loudspeakers are placed on a wall some distance x apart. A listener stands directly in front of one of the speakers, 4m from the wall. The speakers are being driven by a single oscillator at a frequency of 300 Hz. The speed of sound is 343 m/s. What is the minimum distance x the speakers can be apart so the listener hears the waves interfering constructively

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.

This is the number of complete movements of a wave per second.