describe the different spheres of earth. what is each one made up of?
which sphere is the largest and what are the layers of that one?
how do these interact with one another (provide at least 2 specific examples)?
how do humans interact or affect the different spheres (give at least 2 examples)?
(answer all questions correctly and i will give 23 points and a

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.