A Styrofoam ice chest is 2 cm thick. If the inside of the chest is at 0ºC and outside the chest it is 25ºC, estimate the heat transfer by conduction through the Styrofoam per unit area.
What will be an ideal response?
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According to this diagram, how much more abundant is hydrogen in the universe than nitrogen?
A) Hydrogen is about 10,000 times as abundant as nitrogen. B) Hydrogen is about 30% more abundant than nitrogen. C) Hydrogen is about 10 times as abundant as nitrogen. D) Hydrogen is about 4 times as abundant as nitrogen.
In an RC circuit, what fraction of the final energy is stored in an initially uncharged capacitor after it has been charging for 3.0 time constants?
A. 0.84 B. 0.90 C. 0.75 D. 0.60 E. 0.03
In an ideal case rays coming from an object toward a lens or mirror should be reasonably close to the optic axis. To the extent that this condition is not completely met, which one of the following effects occurs?
a. spherical aberration b. mirages c. chromatic aberration d. light scattering
The big bang only created hydrogen and helium (with miniscule amounts of lithium) because____
a. gamma ray photons disrupt large nuclei more easily b. antimatter is attracted to large nuclei, leaving only light nuclei c. heavier elements can only be formed through fusion d. elements with an atomic weight of 5 or 8 are unstable e. temperatures were high enough to fuse hydrogen, but not helium