Saved if a moment vector is known in 3d space, how do we determine the resultant moment about a given axis? turn the moment into a linear force and apply it to the end of the axis multiple the moment vector by the length of the axis take the cross product of the moment vector and the axis vector dot product the moment vector with the unit vector of the axis

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.