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
Physics, 22.06.2019 01:20, Kjcampbell2
Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.
Answers: 3
Physics, 22.06.2019 14:20, jadahilbun01
A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.
Answers: 3
Imagine an alternative universe where the characteristic decay time of neutrons is 3 min instead of...
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