A box with a total surface area of 1.47 m2 and a wall thickness of 3.91 cm is made of an insulating material. A 15.9 W electric heater inside the box maintains the inside temperature at 8.4 ◦C above the outside temperature. Find the thermal conductivity of the insulating material. Answer in units of W/m · ◦ C.

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

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.)

How would a small bar magnet be oriented when placed at position x?