Rain that freezes on striking a cold surface gives rise to a(n) ______________ storm
a. hail
b. rain
c. ice
d. snow
c
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By what primary heat transfer mechanism does the sun warm the earth?
A) convection B) conduction C) radiation D) All of the above processes are equally important in combination.
Two parallel wires carry currents in the same direction and exert a force on each of magnitude F for each meter of length. One of the currents is now reversed in direction and doubled in magnitude. What are the resulting magnitude for the force per meter of length and its direction relative to the wires?
1.2F, attractive 2.2F, repulsive 3.4F, attractive 4.4F, repulsive
How do we know that there can only be insignificant amounts of dark matter in our solar system?
What will be an ideal response?
What explains the metallicity difference between population I and population II stars?
A. Population I stars formed in regions of the MWG where heavy elements were plentiful. Population II stars formed in regions of the MWG where heavy elements were scarce. As a result of their location of formation, the two populations have differing metallicities. B. Population II stars are older than population II star and have therefore had a much longer time to produced heavy elements. C. Population II stars formed when the abundance of elements heavier than hydrogen and helium was low. Population I stars formed later, after mass lost by dying members of the first generations of stars had enriched the interstellar medium with elements heavier than hydrogen and helium. D. Population I stars are of a spectral type like our Sun or possibly cooler. Population II stars are of a spectral type that is hotter than our Sun. Heavier elements form in the hotter, more massive stars, causing the metallicity difference between the two populations.