The fusion of deuterium (one proton + one neutron) with tritium (one proton + two neutrons) to form a helium nucleus (two protons + two neutrons) and one spare neutron releases about 17 mev of energy. ( 1 ev = 1.6 x 10-19 joules). given that the sun produces about 380 x 1026 watts of luminous energy, what is the total mass of deuterium and tritium that must be fusing each second to provide this energy output? if we could master the engineering to harness this sort of fusion reaction, how many grams of material would we need to fuse each second to provide power for the citizens of california at 2kw per person (39 million people), assuming 50% efficiency

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

Sound energy is produced when an object vibrates. examples are 1- a balloon popping2-a whistle3- a waterfall