An electrically polarized object normally has
A) a net charge of zero.
B) displaced charges.
C) both of these
D) none of the above
Answer: C
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A 0.28-kg stone you throw rises 34.3 m in the air. The impulse the stone receives from your hand while being thrown is
A.
s, up.B.
s, down.C.
s, up.D.
s, down.E.
s, up.A homeowner has a new oil furnace which has an efficiency of 60%. For every 100 barrels of oil needed to heat his house, how much (in barrels of oil) goes up the chimney as waste heat?
a. 20 b. 60 c. 40 d. 80 e. 10
General Questions: In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.
A. True B. False C. It depends on whether the collision is a head-on collision or a rear-end collision.
A narrow copper wire of length L and radius b is attached to a wide copper wire of length L and radius 2b, forming one long wire of length 2L
This long wire is attached to a battery, and a current is flowing through it. If the electric field in the narrow wire is E, the electric field in the wide wire is A) E. B) 2E. C) 4E. D) E/2. E) E/4.