Assuming the Lawson criterion for the deuterium-tritium interaction, ?? ? 1014 s/cm3, what is the minimum plasma ion density at 10 11 K?
a. 10–3 s/cm3
b. 103 s/cm3
c. 1025 s/cm3
d. 1036 s/cm3
e. More information is needed.
e
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The Moon has been unable to hold any atmosphere because:
A) it has a low escape velocity. B) it cooled very slowly during its formation. C) its orbital velocity is higher than its escape velocity. D) its gravitational acceleration is more than 10 m/s2.
What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1 000 g at a radius arm of 15.0 cm?
a. 40.7 rev/s b. 75.4 rev/s c. 81.4 rev/s d. 151 rev/s
Consider the two surfaces shown below. They are both immersed in a uniform vertical electric field. (The tile vectors shown are for a typical tile on each surface.) 
For which surface is the value of 
larger?
A. The horizontal surface. B. The tilted surface. C. The value is the same nonzero number for both. D. The value is zero for both surfaces. E. One cannot compare the values from what is given.
Which of the following formed elements has a nucleus?
a) Platelet b) Red blood cell c) White blood cell d) A and B e) All of the above