Arock has vp=3.0 km/s and vs=1.5 km/s. (1) if a p wave traveling through the rock meets the surface at angle of 30°, determine the reflected p and s waves and the angles of reflections. (2) if an s wave traveling through the rock meets the surface at an angle of 60°, determine the reflected waves and the angles of reflections. show your steps to get the answers and sketch a figure showing all waves for case 1 and 2, respectively.

What must be the same for any two resistors that are connected in series ? a. the potntial diffrence across each b. the rate at which charge moves through each c. the rate at which energy is used by each d. the resistance to the flow of charge of each

Transfer chemicals from one location to another to weather objects. a-water b-physical weathering c-chemical weathering

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.