The charge per unit length on an insulator is 6.2 ?C/m. On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
a. There are 7.8 × 10^13 more electrons than protons.
b. There are 7.8 × 10^13 more protons than electrons.
c. There are 3.9 × 10^13 more protons than electrons.
d. There are 3.9 × 10^13 more electrons than protons.
b
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Energy in Nuclear Reactions: Consider the nuclear reaction 
N + 
He ? 
O + 
H. The known atomic masses are
N: 14.003074 u
/>He: 4.002603 u
H: 1.007825 u
O: 16.999131 uWhat is the Q-value (or reaction energy) of this reaction? (1 u = 931.5 MeV/c2)
A. 1.191 MeV
B. -1.191 MeV
C. 1.279 × 10-3 MeV
D. -1.279 × 10-3 MeV
What is tidal heating?
A) a source of internal heat caused by varying tidal forces acting on a moon or other object B) a source of internal heat that occurs on all moons that are large enough to be spherical C) a source of surface heating caused by the sloshing of water or other liquids D) a source of surface heating caused by active volcanoes like those on Io
A grandfather clock that is regulated by a pendulum is taken to the Moon, where the acceleration of gravity is less. Compared to an identical clock on Earth, the grandfather clock on the Moon will
A. run slow. B. run fast. C. keep time at the same rate.
The highest frequency visible light is
a. violet. b. red. c. blue. d. green. e. yellow.