In Robert Frost's classic poem, when he ends with "ice will suffice," the universe is:
A) closed.
B) critical density.
C) open.
D) Euclidean.
E) Relativistic.
C
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When an electron drops to a lower energy level in an atom, but no other interactions take place
A) the atom may emit a photon of light of a specific wavelength. B) the total energy of the atom remains unchanged. C) the atom must slow its speed moving through space. D) the atom must increase its speed moving through space. E) the electron must become slightly more massive.
A pan of water boils on the stove.
C. Consistent D. Inconsistent
A slender uniform rod 100.00 cm long is used as a meter stick. Two parallel axes that are perpendicular to the rod are considered. The first axis passes through the 50-cm mark and the second axis passes through the 30-cm mark
What is the ratio of the moment of inertia through the second axis to the moment of inertia through the first axis? A) I2/I1 = 1.5 B) I2/I1 = 1.7 C) I2/I1 = 1.9 D) I2/I1 = 2.1 E) I2/I1 = 2.3
Galactic collisions ____
a. are very rare, since few galaxies are in clusters b. will cause stars in each galaxy to collide and trigger supernova events c. often trigger bursts of star formation d. only happen in poor clusters e. usually break large galaxy into several small ones