The Sun makes most of its energy by the CNO cycle
a. True
b. False
Indicate whether the statement is true or false
False
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Uniform Electric Fields: Consider a uniform horizontal electric field of 50 N/C directed toward the east. If the electric potential measured at a given point is 80 V, what is the potential at a point 1.0 m directly west of that point?
A. 30 V B. 50 V C. 80 V D. 130 V
In science, "positive feedback" is a term that applies to
A) a process undergoing a self-reinforcing cycle that amplifies some initial effect. B) commentary that reflects a high opinion of a scientist's work. C) feedback that has a positive electrical charge. D) a process that can only continue as long as most scientists continue to support it.
Once oxygen started to be manufactured by cyanobacteria, why did it take so long to build up to significant levels?
A) initially most of the oxygen escaped into space B) oxidation of surface rock and ocean minerals occurred C) initially most of the oxygen produced dissolved in the oceans D) initially most of the oxygen was converted into water by reaction with hydrogen
A large, metallic, spherical shell has no net charge. It is supported on an insulating stand and has a small hole at the top. A small tack with charge Q is lowered on a silk thread through the hole into the interior of the shell. What is the charge on the outer surface of the shell now?
1.Q 2.Q/2 3.0 4.-Q/2 5.-Q