The Moon orbits Earth. This orbit causes the Moon to look different over the course of about a month. These differences are called phases. One phase is called a full moon. Look closely at the table to the right. What can you conclude about a full moon? A. A. A full moon only occurs in the summer months. B. B. A full moon always occurs after a first quarter moon. C. C. A full moon always occurs on the 5th day of the month. D. D. A full moon always occurs before the first quarter moon.

Gam radio signals can usually be heard behind a hill, but fm often cannot. that is, am signals bend more than fm. explain. (radio signals, as we shall see, are carried by electromagnetic waves whose wavelength for am is typically 200 to 600 m and for fm about 3 m.)

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.

What was the first instrument to ever record an earthquake?