Why is iron significant to understanding how a supernova occurs?
A) Iron cannot release energy either by fission or fusion.
B) Iron is the heaviest of all atomic nuclei, and thus no heavier elements can be made.
C) Supernovae often leave behind neutron stars, which are made mostly of iron.
D) The fusion of iron into uranium is the reaction that drives a supernova explosion.
A) Iron cannot release energy either by fission or fusion.
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What is not a main source of evidence for the existence of dark matter?
A) massive blue stars B) rotation curves of disk galaxies C) stellar motions in elliptical galaxies D) velocities and positions of galaxies in clusters of galaxies E) gravitational lensing by clusters of galaxies
Are the Sun and the Moon ever above the horizon at the same time?
A. yes, always B. no, never C. yes, sometimes D. The moon always rises as the sun sets.
Energy is transported from the tropics to the polar regions chiefly by
A) winds. B) ocean currents. C) interchange of carbon dioxide. D) none of the above
A car starts from rest and travels a distance of 100 m in 20 seconds with a constant acceleration. The velocity of the car is at the end of the 20 second interval is
A. 25 m/s. B. 20 m/s. C. 15 m/s. D. 10 m/s. E. 5.0 m/s.