Einstein originally added a cosmological constant to his equations to prevent a presumably static universe from either contracting or expanding
Modern cosmologists have reintroduced it to their equations, where as the source of dark energy it causes the universe to expand ever faster.
Indicate whether the statement is true or false
TRUE
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Lobate scarps are believed to have formed on Mercury when its interior cooled and shrank
a. True b. False Indicate whether the statement is true or false
Of the following which might NOT vanish over one cycle of a cyclic process?
A. the change in the internal energy of the substance B. the change in pressure of the substance C. the work done by the substance D. the change in the volume of the substance E. the change in the temperature of the substance
In grinding a steel knife blade (specific heat = 0.11 cal/g-C°), the metal can get as hot as 400.°C. If the blade has a mass of 80
g, what is the minimum amount of water needed at 20°C if the water is not to rise above the boiling point when the hot blade is quenched in it?
Faraday's law of induction states that the emf induced in a rectangular loop of wire is proportional to
A. the magnetic flux. B. the time variation of the magnetic flux. C. current divided by the time. D. the magnetic flux density times the area of the loop.