The picture below shows three elevators, each carrying a different number of people to different floors. If all the people weigh the same, which elevator is doing the most work? (Weight = Force, and Number of floors = Amount of displacement)

Select one:
a. Elevator 1 is doing the most work.
b. Elevator 2 is doing the most work.
c. Elevator 3 is doing the most work.
d. They're all doing the same amount of work.

Explain the consequences of this addiction to the brain tissue

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.

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2.