The drawing shows a loudspeaker a and point c, where a listener is positioned. a second loudspeaker b is located somewhere to the right of loudspeaker a. both speakers vibrate in phase and are playing a 67.6-hz tone. the speed of sound is 343 m/s. what is the closest to speaker a that speaker b can be located, so that the listener hears no sound? (assume |ac| = 4.00 m.)

Energy flows from the producer level to the level. is called

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.