Current flows through a resistor
A)
with no direction since it is not a vector.
B)
from any potential to any different potential.
C)
from high potential to low potential.
D)
from low potential to high potential.
E)
cannot be determined
C
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Figure C9.12 shows the potential energy function for a certain interaction. This interaction is
A. Always attractive. B. Always repulsive. C. Attractive for small r, but repulsive for large r. D. Repulsive for small r, but attractive for large r.
A solid lead sphere of radius 10 m (about 66 ft across!) has a mass of about 57 million kg. If two of these spheres are floating in deep space with their centers 20 m apart, the gravitational attraction between the spheres is only 540 N (about 120 lb). How large would this gravitational force be if the distance between the centers of the two spheres were tripled?
A. 60 N B. 180 N C. 1620 N D. 4860 N
Which expands more when the temperature is increased? Equal volumes of
A) iron. B) wood. C) ice water. D) helium. E) all expand the same
What is the product of 12.56 and 2.12?
A) 27 B) 26.6 C) 26.23 D) 26.627 E) 26.6270