What is meant by a desiccant?
What will be an ideal response?
A desiccant is a sorbent which typically absorbs or adsorbs a moisture or water
vapor. Desiccants are materials which can dehumidify a region.
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An ice-storage facility uses sawdust as an insulator. If the outside walls are 2 feet thick sawdust and the sideboard thermal conductivity is neglected, determine the R-Value of the walls. Then, if the inside temperature is 25ºF and the outside is 85ºF, estimate the heat gain of the storage facility per square foot of outside wall.
What will be an ideal response?
Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be
A) F. B) 2 F. C) F/2. D) F/4. E) none of the above
The Greeks abandoned their earliest cosmological theory (planets moving in simple circles around Earth) because
A) it did not agree with their observations of the planets. B) it seemed messy and unsatisfying. C) they came to believe that Earth should be at the center of things. D) they came to believe that the sun should be at the center of things. E) Actually, they never did abandon or revise their earliest theory--it was not altered until the time of Copernicus.
Which of the following measurements can be made only by recording and comparing the amount of light received from an astronomical source at many different times?
A) the rate at which a variable star brightens and dims B) the general shape of an interstellar cloud of gas C) the color of a planet D) the number of bright stars in a nearby star cluster