Mrs. buckley asked her physical science class to look at the graph and tell which of the following explanations are most likely true. option a: from 12 to 24 minutes the bicyclist was coasting down a hill. option b: at 35 minutes the bicyclist was not moving. option c: from 6 to 12 minutes the bicyclist was increasing his speed. option d: from 24 to 30 minutes the bicyclist was traveling down a steep hill. question 8 options: all of the options are most likely true. only option c is true. option a and b are true. option c and d are true.

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

With physics question #5? for any !

How is the ideal mechanical advantage of a wheel and axle calculated?