The effect of de-forestation on the global warming problem is that
A) this makes the problem worse, because trees consume ozone from the atmosphere.
B) this actually helps solve the problem, because trees consume ozone from the atmosphere.
C) this actually helps solve the problem, because trees consume carbon dioxide from the atmosphere.
D) this has no effect on the global heating problem, although it has harmful effects in other ways.
E) this makes the problem worse, because trees consume atmospheric carbon dioxide.
E
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Two factors that greatly affect air resistance on falling objects are frontal area and
A) mass. B) weight. C) speed.
A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill, the baby carriage will likely have
A) less momentum. B) about the same momentum. C) more momentum.
An alternative statement of the uncertainly principle tells us that we cannot know precisely both
A) a particle's mass and energy. B) whether a particle is a wave or whether it is truly a particle. C) a particle's energy and the time during which it has this energy. D) a particle's momentum and its energy.
A proton is projected with a velocity of 7.0 × 103 m/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the force that acts on the proton?
A) 0 N B) 3.4 × 10-16 N C) 4.2 × 10-16 N D) 13 × 10-16 N E) 6.7 × 10-16 N