If 10 W/m2 impacts a surface and only 3 W/m2 is reemitted back, what is the surface's albedo as a percent?

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

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.

What is the increase in density of a medium due to wave travel?