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Chapter 44: Q47P (page 1365)
How much energy would be released if Earth were annihilated by collision with an anti-Earth?
this energy will power the sun for years.
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What quark combination is needed to form (a) and (b)
Will the universe continue to expand forever? To attack this question, assume that the theory of dark energy is in error and that the recessional speed of a galaxy a distance from us is determined only by the gravitational interaction of the matter that lies inside a sphere of radius centered on us. If the total mass inside this sphere in,the escape speed from the sphere is (Eq.13.28).(a) Show that to prevent unlimited expansion, the average density inside the sphere must be at least equal to
.
(b) Evaluate this “critical density” numerically; express your answer in terms of hydrogen atoms per cubic meter. Measurements of the actual density are difficult and are complicated by the presence of dark matter
Calculate the disintegration energy of the reactions
If Hubble’s law can be extrapolated to very large distances, at what distance would the apparent recessional speed become equal to the speed of light ?
Does the proposed decay conserve (a) electric charge, (b) spin angular momentum, and (c) strangeness? (d) If theoriginal particle is stationary, is there enough energy to create thedecay products?
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