Alistener is sitting somewhere on the line between two loudspeakers that are 10 m apart. the speakers are each emitting a sine wave with the same frequency and no initial phase difference. the listener finds that the sound is completely cancelled when he is at a distance of 3.5 m from one of the speakers. what is a possible frequency of the sound?

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?