The electric field associated with a uniformly charged hollow metallic sphere is the greatest at:
a. the center of the sphere.
c. infinity.
b. the sphere's outer surface.
d. the sphere's inner surface.
B
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What is one possible reasons Jupiter and Saturn radiate more energy than they receive from the Sun?
a. Magnetic and electric fields heat the planet. b. Fusion reactions of hydrogen into helium inside the planet provide an additional heat source. c. The planets are still radiating heat from when they first formed. d. Friction between the planet and its moons heat the planet.
The radioactive half-life of a material is the time for
A) half of an original quantity of the material to decay. B) its decay rate to reduce to half. C) both of these D) neither of these
A supertanker filled with oil has a total mass of 6.1 × 10^8 kg. If the dimensions of the ship are those of a rectangular box 300 meters long, 80 meters wide, and 40 meters high, determine how far the bottom of the ship is below sea level. (rsea = 1 020 kg/m3.)
a. 10 m b. 15 m c. 20 m d. 25 m e. 30 m
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
Vectors 
and 
have equal magnitudes. Which statement is always true?
A.
+ = 0B.
- = 0C.
is perpendicular to + .D.
is perpendicular to+.E.
+ equals the magnitude of .