The impulse-momentum relationship is a direct result of
A) Newton's first law.
B) Newton's second law.
C) Newton's third law.
Answer: B
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An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10 µC that does not touch the conductor. There are no other charges in the vicinity
Which statement about this conductor is true? (There may be more than one correct choice.) A) The inner surface of the conductor carries a charge of -10 µC and its outer surface carries no excess charge. B) The inner and outer surfaces of the conductor each contain charges of -5 µC. C) The net electric field within the material of the conductor points away from the +10 µC charge. D) The outer surface of the conductor contains +10 µC of charge and the inner surface contains -10 µC. E) Both surfaces of the conductor carry no excess charge because the conductor is uncharged.
The figure shows a distance versus time graph for an object
The acceleration of the moving object is
a.
zero.
b.
constant.
c.
increasing.
d.
decreasing.
e.
not determinable.
At any finite temperature, the probability that the Fermi energy is occupied with free electrons is equal to:
(a) 1 (b) 0 (c) ½ (d) A number less than 1 that is dependent upon the temperature
What is the cosmic microwave background?
A. radiation released when neutral atoms formed in the young Universe B. radio noise from Seyfert galaxies C. radiation from the first stars formed when the Universe was young D. radiation from hot gas in intergalactic space