Which statement about soil color is true? select one: a. soils vary in color based on their depth. b. soils do not vary in color based on their depth. c. soils close to earth's surface are always darker. d. soils far from earth's surface are always darker.

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?