What are the si units for average speed?

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

In a star, nuclear fusion occurs in the a. photosphere. b. corona. c. radiative zone. d. core.

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