Use the information about igneous rocks A–D to classify each one as intrusive or extrusive and basaltic or granitic. Fill in the chart with A, B, C, or D. Rock A—dark-colored large grains
Rock B—large crystals, high percentage of silica
Rock C—fine-grained texture, light-colored
Rock D—from Hawaiian volcano area, no visible crystals

Extrusive
Intrusive
Basaltic
1.
2.
Granitic
3.
4.

Modify the equation fδt=δ (mv) to find the force of friction.

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)