A mole of hydrogen gas with a volume of 0.080 m³ is compressed adiabatically to half of its original volume. If the initial average kinetic energy per hydrogen molecule is 1.38x10^-20 J, what are the initial and the final pressure of the hydrogen gas? Assume that hydrogen is a diatomic gas.

What are the theoretical properties of a gas at a temperature of 0 kelvin?

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)