The vast numbers of electrons in a coin don't fly off the surface because
A) mutual repulsion is incomplete.
B) they are attracted by an equal number of protons.
C) they are strongly bonded to their atoms.
D) all of the above
E) none of the above
Answer: B
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Sometimes, when a theory has been refined, tested, and confirmed so often that scientists have great confidence in it, it is called__________
A) parallax B) a hypothesis C) a natural law D) a model
What is the latest hypothesis for the creation of the ovoids on the surface of Miranda?
a. A secondary bombardment episode occurred near the Kuiper belt b. Nitrogen ices warmed by the Sun melt and refreeze c. Gravitation pulled together fragments of an earlier shattered moon d. Tectonic plate movement at various subduction zones in its oceans e. internal heat driving large and slow convection currents in the icy mantle
Doubling the radius of a sphere results in increasing its volume by a factor of
a. 2. b. 4. c. 8. d. 8?.
A metal blade spins at a constant rate of 5.0 revolutions per second about a pivot through one end of the blade. This rotation occurs in a region where the component of the earth's magnetic field perpendicular to the blade is 30 ?T. If the blade is 60 cm in length, what is the magnitude of the potential difference between its ends?
a. 0.24 mV b. 0.20 mV c. 0.17 mV d. 0.27 mV e. 0.34 mV