What is the specific heat of wood ?

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

Observations show that interstellar clouds can have almost any shape and

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.