What would happen to you if you fell out of a spaceship, naked? hollywood has given us many portrayals of this event, with the skin boiling or instantly freezing; but what actually happens, and what effect is most severe? the lack of oxygen is one: we know that the humans can only survive a number of minutes without breathing. but there are a number of other factors to consider. (a) assume a human is a 2 m tall cylinder of 75 kg of water. estimate how long it would take for its temperature to drop by 10o c. is heat loss a significant factor? (b) in light of the answer to part (a), use the phase diagram for water to explain what would begin to happen to the blood in surface capillaries (and, eventually, the blood in major veins and arteries). (c) should you hold your breath? why/why not? what would happen to the air in your lungs? what ideal gas process is approximated? (d) sun exposure is a serious concern. 2nd degree burns can occur if the skin absorbs more than about 5 j/cm^2 . if you are floating in near-earth orbit, how long do you have before you burn? (e) are there any other factors we should consider? which do you think is the most life-threatening?
answer with numeric answers when needed, not just conceptually.

Amanometer is used to measure the air pressure in a tank. the fluid used has a specific gravity of 1.25, and the differential height between the two arms of the manometer is 34 in. if the local atmospheric pressure is 12.7 psia, determine the absolute pressure in the tank for the cases of the

What happens to the light rays when they hit the specimen?

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