In a nuclear fusion reactor, the Lawson criterion prescribes the necessary conditions, as related to density and confinement time of the plasma fuel, in order that the process produces a net power output. If the fuel density were doubled, by what factor would the required confinement time change?
a. 0.25
b. 0.50
c. 1.4
d. 2.0
b
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Energy Conservation With Conservative Forces: A toy rocket that weighs 10 N blasts straight up from ground level with an initial kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height above the ground does it rise, assuming no air resistance?
A. 1.0 m B. 10 m C. 14 m D. 24 m
After reviewing the data from Procedures 5 and 6, in general how do you think the voltages across individual elements in a parallel circuit compare with the total voltage supplied to the circuit?
What characteristic of neutrinos other than their flavor is essential to the theory of neutron oscillation?
a. Their three different wavelengths. b. Their three different frequencies. c. Their three different electric charges (+, 0, and -). d. Their three different masses. e. Their three different colors.
Which answer below is not a statement of the second law of thermodynamics?
A. Real processes proceed in a preferred direction. B. Energy does not flow spontaneously by heat from a cold to a hot reservoir. C. The entropy of the universe increases in all natural processes. D. In theory, heat engines working in a cycle employ reversible processes. E. You cannot construct a heat engine, operating in a cycle that does nothing but take heat from a reservoir and perform an equal amount of work.