A metal rod is placed so that it connects a heat source at 50°C and a heat sink at 20°C. During time, t, an amount of heat, Q. is transferred from the source to the sink. If the
metal rod is replaced by another rod made of the same material, but of twice the length, how much heat will be transferred during the same amount of time, t?
A.1/2Q
B.4Q
C.1/4Q
D.2Q

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

What statements accurately describe atoms

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.)