A puddle holds 160.0 g of water. If 0.5 g of water evaporates from the surface, what is the approximate temperature change of the remaining water? (Lv = 540 cal/g)
a. +1.7 C°
b. ?1.7 C°
c. +0.17 C°
d. ?0.17 C°
b
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Relatively long duration gamma-ray bursts are produced by:
A) novae. B) supernovae. C) hypernovae. D) neutron star mergers. E) black hole mergers.
The planets all lie in nearly the same plane resulting in a disk-like structure for the solar system. This disk-like structure is believed to exist because
a. the solar nebula from which the planets formed had a disk-like structure. b. the bipolar flow from the young Sun cleared all material out of the nebula except that in the disk. c. Jupiter's gravity was great enough to pull all of the other planets to the plane of its orbit. d. the Milky Way Galaxy from which the planets condensed has a disk-like structure
What are some advantages of radio telescopes over optical scopes?
What will be an ideal response?
The rate of heat flow by conduction through a slab is Pcond. If the slab thickness is doubled, its cross-sectional area is halved, and the temperature difference across it is doubled, then the rate of heat flow becomes:
A. 2Pcond B. Pcond/2 C. Pcond D. Pcond/8 E. 8Pcond