Physics, 14.12.2019 06:31 jjjjjjjbvhnchjkj
Imagine an alternative universe where the characteristic decay time of neutrons is 3 min instead of 15 min. all other properties remain unchanged from what was discussed in class.
(a) show that the maximum possible value of the primordial helium fraction is: ymax = 2f 1 + f (1) where f = nn/np ≥ 1 is the neutron-to-proton ratio at the time of nucleosynthesis. prove that this assertion is true.
(b) estimate the maximum fraction of the baryonic matter in the form of helium today. you may assume all he nuclei exist in the form of helium 4
Answers: 1
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Physics, 22.06.2019 10:00, sofiaisabelaguozdpez
Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?
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Find the equation for the plane through upper p 0 left parenthesis negative 4 comma negative 8 comma negative 5 right parenthesis perpendicular to the following line. xequalsnegative 4 minus t, yequalsnegative 8 plus 2 t, zequals3 t, minusinfinityless thantless thaninfinity
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