Whats this i give 13 points

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

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.

During the past 150 years in the united states, how did energy consumption compare to population growth