Carbon dating requires that the object being tested contain
A) organic material.
B) inorganic material.
C) charcoal.
D) none of the above
Answer: A
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Compressed air from a tank blows on a windmill. The windmill is connected to a generator that produces electrical energy. Part of that electrical energy is used to compress more air into the tank.
A. first kind B. second kind
Which two factors determine a star's luminosity?
A) radius and surface temperature B) radius and distance from Earth C) surface temperature and distance from Earth D) mass and radius E) mass and surface temperature
The presence of a Mercurian magnetic field surprised the planetary scientists on the Mariner 10 team because:
A) Mercury is low in iron. B) Mercury spins to rapidly to produce a stable dynamo. C) It's still too hot for its core to have differentiated. D) The dynamo theory predicted that Mercury was spinning too slowly for one. E) Mercury lacks an iron core.
The segment of wire (total length = 6R, including the incoming and outgoing portions of the wire) is formed into the shape shown and carries a current I. What is the magnitude of the resulting magnetic field at the point P?
A.
B.
C.
D.
E.
