Which of the following is a trend among the main sequence stars?

A) Most of the stars are white or red.

B)The hotter the star, the more brightly it burns.

C) Stars dimmer than the Sun are of class O or B

D) The larger stars emit light that is blue.

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.