A2.5kg metal bar is quenched from 800°c by immersion in a closed insulated tank of water containing 50 litres of water initially at 20°c. assuming that both water and the metal bar can be treated as incompressible, determine the final temperature of the metal bar and the water, whose specific heat capacities are 0.500 and 4.18 kj/kg. k respectively, and hence, using gibbs' equation, calculate the amount of entropy produced by the quenching process.

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.

The answer is b.the gaseous state is electrically positive, while the plasma state is electrically negative.