Ascientist studies how sunlight affects a person's skin. which of the following is a testable question about this topic? a, does being in the sun make your skin dry? b. do people look better when they have a suntan? c. what is the most enjoyable time to be in the sun? d. should children be allowed to lie in the sun?

Oxygen gas enters well-insulated diffuser at 25 lbf/in.2, 420r, with a velocity of 860 ft/s through a flow area of 1.6 in.^2. at the exit, the flow area is 12 times the inlet area, and the velocity is 19 ft/s. the potential energy change from inlet to exit is negligible. assuming ideal gas behavior for the oxygen and steady-state operation of the diffuser, determine the following: (a) the exit temperature, in r(b) the exit pressure, in lbf/in.^2 (c) the mass flow rate, in lb/s