Two spectators at a soccer game in montjuic stadium see, and a moment later hear, the ball being kicked on the playing field. the time delay for spectator a is 0.201 s and for spectator b is 0.122 s. sight lines from the two spectators to the player kicking the ball meet at an angle of 90°. how far are (a) spectator a and (b) spectator b from the player? (c) how far are the spectators from each other? (take the speed of sound to be 343 m/s.)

Asample of a gaseous substance changes into a liquid

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

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?