The Sun's surface seethes and churns with a bubbling pattern. Why?
A) We are seeing hot gas rising and cool gas falling due to the convection that occurs beneath the surface.
B) The churning is an illusion created by varying radiation, as the gas on the Sun's surface is actually quite still.
C) The churning gas is being stirred up by the strong solar wind.
D) The Sun's surface is boiling.
A
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What kind of energy does a speeding bullet possess?
A) kinetic B) radiative C) mechanical D) potential
The Doppler shift is used to find
A) astrometric binaries. B) spectroscopic binaries. C) photometric binaries. D) visual binaries. E) eclipsing binaries.
The two major physical theories of the 20th century are
A) superconductivity and the theory of light. B) electromagnetic theory and quantum theory. C) quantum theory and the theory of relativity. D) the theory of relativity and electromagnetic theory. E) electromagnetic theory and the theory of gravity.
The solubility parameter of polyethylene is 16.6 (MPa)0.5 and for ethanol it is 26.0 (MPa)0.5. Should ethanol dissolve polyethylene? _____________
Fill in the blank(s) with the appropriate word(s).