Determine the mass [kg] of the compressed air in a scuba diving tank given the following information. the internal volume of the tank is 10 liters [l] and the absolute pressure inside the tank is 20.8 mega pascal [mpa]. the temperature of the air inside the tank is 20 degrees celsius [oc]. use the ideal gas law to solve for the mass. the ideal gas law is given by:

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.