In the diagram below, a stationary source located at point s produces sound having a constant frequency of 512 hertz. observer a, 50 meters to the left of s, hears a frequency of 512 hertz. observer b, 100.0 meters to the right of s, hears a frequency lower than 512 hertz. a) observer a is stationary, and observer b is moving away from point s. b) observer a is stationary, and observer b is moving toward point s. c) observer a is moving away from point s, and observer b is stationary. d) observer a is moving toward point s, and observer b is stationary.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

What are similarities and differences of reflection, refraction, diffraction and absorption?