Two m^3 of air in a rigid, insulated container fitted with a paddle wheelis initially at 293 k, 200 kpa. the air receives 710 kj by work from the paddle wheel. assuming the ideal gas model with cv=0.72 kj/kg. k, determine for the air (a) the mass, in kg, (b) final temperature, in k, and (c) the amount of entropy produced, in kj/k.

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.