When the al ball is charged, it will repel from the other al ball. the more charge on the al balls, the more repulsion. when both al balls have the same charge q, find an expression that lets you find the charge q from the measured separation distance r; i. e. a function q(r), which depends on the string length l, the al ball’s mass m, and the separation distance r between the al balls. make sure to have a schematic drawing as well.

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.

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.)

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.