The orbits of most asteroids:
A) lie beyond Neptune.
B) lie entirely beyond the orbit of Mars.
C) cross the orbit of Mars.
D) cross the orbit of Earth.
E) cross the orbits of all four terrestrial planets.
B
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Polymers have a lower surface energy than metals and ceramics do, because at the polymer surface the _____________ bonds between LCMs are broken.
Fill in the blank(s) with the appropriate word(s).
Which of the following lets you conclude that a compact object cannot be a neutron star and that it must be a black hole?
A) If the mass of the compact object is greater than about 0.5 solar masses B) If the mass of the compact object is greater than about 3 solar masses C) If the mass of the compact object is greater than about 1.5 solar masses D) If the mass of the compact object is greater than about 2 solar masses
What part of the Apollo spacecraft actually returned to Earth?
a. descent rocket b. lunar module c. rocket boosters d. command module e. support stage
The notation used to represent an antiparticle is
a. the particle symbol with a bar over it. b. e+, in the case of the positron. c. ?+, in the case of the antimuon. d. all of the above.