What is true of the Moon's orbital and rotational periods?
A) The rotational period is longer.
B) The orbital period is longer.
C) The rotational period varies with the Moon's phase.
D) They are equal.
E) The orbital period is greatest at full moon.
D
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The most important force between a proton and a neutron is the ______________ force
a. strong nuclear b. quark c. electromagnetic d. gravitational
The first complex life appeared on Earth about 0.5 billion years ago during the
a. Jurassic Period. b. Mississippian Period. c. Cambrian Period. d. Precambrian Period. e. Neolithic Period.
The helium in a child's balloon is composed of
A) former alpha-particle. B) former beta particles. C) both of these D) neither of these
Red dwarf stars (stars between 0.08 and 0.5 solar masses) evolve very differently than other stars as they age because ____
a. they are formed from pure hydrogen b. they never reach the minimum temperature required to fuse carbon c. they never form white dwarf as remnants d. they are always part of a close binary system e. their interiors are well mixed, through strong convection