Abrick is dropped from the top of a building through the air (friction is present) to the ground below. part a how does the brick's kinetic energy (k) just before striking the ground compare with the gravitational potential energy ugrav at the top of the building? set y=0 at the ground level. how does the brick's kinetic energy () just before striking the ground compare with the gravitational potential energy at the top of the building? set at the ground level. k is equal to ugrav. k is greater than ugrav. k is less than ugrav.

Calculate the amount of heat produced when 18000 coulombs of charge is transferred in one hour through a potential difference of 50v

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

Estimate the schwarzschild radius (in kilometers) for a mini-black hole formed when a superadvanced civilization decides to punish you (unfairly) by squeezing you until you become so small that you disappear inside your own event horizon. (assume that the your weight is 50 kg)