The gravitational pull of Earth acting on an object is zero when the object
a. has zero acceleration.
b. is in free fall.
c. is midway between Earth and the Moon.
d. is in orbit around Earth.
e. none of these
e
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What is the main factor that drives Darwinian evolution?
A) the competition for finite resources B) the need to have sex C) the ability of an organism to harness the energy of the Sun D) the size of an organism
A conducting bar moves as shown near a long wire carrying a constant 50-A current. If a = 4.0 mm, L = 50 cm, and v = 12 m/s, what is the potential difference, VA ? VB?
a.
+15 mV
b.
?15 mV
c.
+20 mV
d.
?20 mV
e.
+10 mV
In general, a stream with a high discharge tends to have
A) increased laminar flow. B) increased turbulent flow. C) a high velocity. D) a narrow stream channel.
A compound resulting from a major fuel impurity is
a. CO2. b. CO. c. SO2. d. HC.