The threshold frequency for dislodging an electron from a zinc metal surface is 8.54 x 1014 Hz. Calculate the minimum amount of energy required to remove an electron from the metal.

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

Energy flows from the producer level to the level. is called

An insulated thermos contains 148 g of water at 72.7 ˚c. you put in a 11.7 g ice cube at 0.00 ˚c to form a system of ice + original water. the specific heat of liquid water is 4190 j/kg•k; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?