The near point (the smallest distance at which an object can beseen clearly) and the far point (the largest distance at which anobject can be seen clearly) are measured for six differentpeople. near point (cm) far point (cm)Avishka 40 infinityberenice 30 300chadwick 25 500danya 25 infinityedouard 80 200francesca 50 infinityPart DOf the farsighted people, rank them by the power of the lens needed to correct their hyperopic vision. Rank these from largest to smallest power required. To rank items as equivalent, overlap them. Francesca, Avishka, Edouard, Berenice

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

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

Amira pulls a 3 pound wagon 4 feet. how much work has she done?