You read a primary source and a secondary source that discuss the same experiment. There is a difference in the conclusions made by these two
sources. Which should you trust more, and why?
O A. The secondary source, because it was in a newspaper
B. The primary source, because it is firsthand information
C. The secondary source, because it is easier to read
D. The primary source, because it is more confusing

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.