Why is iron significant to understanding how a supernova occurs?
A) Iron is the heaviest of all atomic nuclei, and thus no heavier elements can be made.
B) Supernovae often leave behind neutron stars, which are made mostly of iron.
C) The fusion of iron into uranium is the reaction that drives a supernova explosion.
D) Iron cannot release energy either by fission or fusion.
D
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Poor clusters of galaxies often contain an excess of E and SO galaxies
Indicate whether the statement is true or false
A single force is acting on an object. Which type of motion is not physically allowed?
A. the object speeds up B. the object is at rest C. the object slows down D. the object's motion changes direction
A bar magnet is falling through a loop of wire with constant velocity. The south pole enters first. As the magnet leaves the wire, the induced current (as viewed from above):
a. is along the length of the magnet. c. is counterclockwise. b. is clockwise. d. is zero.
Which has the greatest number of molecules?
A) 28 g of nitrogen, N2 B) 32 g of oxygen, O2 C) 32 g of methane, CH4 D) 38 g of fluorine, F2