Suppose NASA sends a space shuttle to explore another planet. It has to take off from Earth, land on another planet, and then take off to return to Earth. What forces will the shuttle have to overcome to leave Earth's surface? Which planet would be the most difficult to launch from and why?

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.