An object that is moving with an acceleration different from zero will always have a(n) ______________ velocity
a. changing
b. increasing
c. constant
d. decreasing
a
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The planets of the solar system were formed
a) as condensations/accretions of hot gases ejected from the Sun b) by the accumulation of many comets c) by a near collision between the Sun and a nearby star d) as individual condensation/accretion centers in a rotating solar nebula e) by the collapse of a single higher mass star into a black hole
The Apollo and Aten asteroids have orbits that:
A) cross the orbit of Earth at perihelion. B) cross the orbit of Mars, but not the Earth, at perihelion. C) remain between Mars and Jupiter, in the main belt. D) stay sixty degrees ahead of or behind Jupiter. E) stay out beyond Neptune.
The explosion of a supernova typically leaves behind
a. a planetary nebula. b. a shell of hot, expanding gas with a white dwarf at the center. c. a shell of hot, expanding gas with a pulsar at the center. d. nothing is ever left behind.
Why are clay surfaces good at promoting the formation of biological polymers?
A) they are the only types of material monomers will stick to B) they bring monomers close together, allowing them to react with each other C) they are very common on the Earth D) clays are made of biological polymers