Will give which of these statements is true? there is no danger from lightning if it is not raining. the rubber soles of shoes or rubber tires on a car will protect you from being struck by lightning. heat lightning occurs after very hot summer days and poses no threat. people who have been struck by lightning do not carry an electrical charge and can be touched.

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.