1. two loudspeakers are placed 4.5 m apart. they produce the same sounds, in step, at a frequency of 829 hz. constructive interference is observed at point p, which is 5.30 m from one loudspeaker and a distance x from the other. which is a possible value of x? assume the speed of sound is 340 m/ a.6.60 b. 6.77 c. 6.80 d. 6.88 e. 6.53 2. two loudspeakers are placed 6.0 m apart. they produce the same sounds, in step, across a frequency range of 252 hz to 665 hz. point p is located 5.10 m from one loudspeaker and 3.60 m from the other. what frequency of sound from the two speakers will produce constructive interference at point p? assume the speed of sound is 344 m/s. a. 631 b. 401 c. 459 d. 573 c. 516

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

An electromagnet is a device in which moving electric chargers in a coil of wire create a magnet.whats one advantage of using electromagnetic in devices