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.

An internally reversible refrigerator has a modified coefficient of performance accounting for realistic heat transfer processes of where qin is the refrigerator cooling rate, qout is the heat rejection rate, and is the power input. show that copm can be expressed in terms of the reservoir temperatures tc and th, the cold and hot thermal resistances rt,c and rt,h, and qin, as where rtot rt,c rt,h. also, show that the power input may be expressed as 1.39 a household refrigerator operates with cold- and hot-temperature reservoirs of tc 5 c and th 25 c, respectively. when new, the cold and hot side resistances are rc,n 0.05 k/w and rh,n 0.04 k/w, respectively. over time, dust accumulates on the refrigerator’s condenser coil, which is located behind the refrigerator, increasing the hot side resistance to rh,d 0.1 k/w. it is desired to have a refrigerator cooling rate of qin 750 w. using the results of problem 1.38, determine the modified coefficient of performance and the required power input w under (a) clean and (b) dusty coil conditions. internally reversible refrigerator qout qin w high-temperature reservoir low-temperature reservoir th th,i tc,i tc high-temperature side resistance low-temperature side resistance w qin th tc qinrtot tc qinrtot copm tc qinrtot th tc

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)

The amount of potential energy possessed by an elevated object is equal to what?