Part of the current atmosphere of Earth is believed to be
a. the remnants of the original hydrogen and helium gas from the solar nebula attracted by the protoplanet.
b. the result of the melting and vaporizing of the glaciers from the last ice age.
c. composed primarily of hydrogen and helium.
d. composed of gases that were outgassed from the heated rocks sometime after the planet formed.
e. the result of a collision between the Sun and another star.
d
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Simple Harmonic Motion: The position of an object that is oscillating on a spring is given by the equation x = (17.4 cm) cos[(5.46 s-1)t]. What is the angular frequency for this motion?
A. 0.183 rad/s B. 5.46 rad/s C. 2.34 rad/s D. 17.4 rad/s E. 0.869 rad/s
What have studies of sunquakes, or helioseismology, revealed?
A) The Sun vibrates only on the surface. B) "Sunquakes" are caused by similar processes that create earthquakes on Earth. C) The Sun generates energy by nuclear fusion. D) Our mathematical models of the solar interior are fairly accurate. E) Neutrinos from the solar core reach the solar surface easily.
Supernova remnants ________.
A. may contain up to 10 solar masses of material ejected from the star B. initially expand at thousands of km/s C. are important for mixing material into the interstellar medium D. All of these choices are correct.
Angular momentum __________ conserved
Fill in the blank(s) with correct word