An astronaut who was 30 years old left to explore the galaxy in 2020, on a spaceship
travelling at 2.5 x 108 m/s. he is expected to return in 2060. about how old will he appear to be?

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?

Lightning is an example of what phenomenon? a release of a large amount of energy an absorption of a large amount of energy a natural electric circuit a natural electric current

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.