A capillary tube is partially filled with liquid water at 40 C, evacuated to remove all air, and sealed, after which the liquid fills 20% of the tube (by volume). The tube is then gradually heated until a temperature is reached for which the vapor-liquid interface in the tube disappears. a. Use information from the steam tables and your understanding of the P-V behavior of pure fluids to estimate the pressure at which the interface disappears from the tube. At that point, is the phase a liquid or a vapor?
b. Repeat (a) for the case where the tube is initially filled 50% of the way with liquid water at 20 C HINT: Imagine what this process looks like on a PV diagram.

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.

Tons?

490 n  f=125n a=2.5m/s2