Two infinite parallel surfaces carry uniform charge densities of 0.20 nC/m2 and ?0.60 nC/m2. What is the magnitude of the electric field at a point between the two surfaces?
A. 34 N/C
B. 23 N/C
C. 45 N/C
D. 17 N/C
E. 90 N/C
Answer: C
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For an atom to be neutral, it must have the same number of:
a. electrons and neutrons b. electrons and protons c. neutrons and protons d. neutrons only e. electrons, neutrons, and protons
The outflow channels on Mars indicate a flood period in the history of Mars. During this time, based on the width and depth of the remaining riverbed, it is thought that the flow rate must have been
A) just a small trickle, barely more than a stream of water. B) moderate, about the flow rate of the Ohio River. C) fairly large, about the flow rate of the current Colorado River. D) significantly large, about the flow rate of the Amazon River. E) enormous, as much as 100 times the flow rate of the Amazon River.
Why is the possible contamination of the Earth by Martian microbes in a future sample return mission not considered to be a significant problem?
A) Martian microbes will certainly be destroyed by terrestrial microbes B) any Martian microbes will be destroyed by high-energy particles and radiation on their trip back to Earth C) Martian microbes will be rapidly destroyed by oxygen in the Earth's atmosphere D) Martian microbes are likely to be quite different than terrestrial microbes and, hence, will probably not be able to affect life on Earth
__________ is the concentration of natural drainage channels in a given area.
What will be an ideal response?