Fundamentals of Physics Extended
Fundamentals of Physics Extended
10th Edition
ISBN: 9781118230725
Author: David Halliday, Robert Resnick, Jearl Walker
Publisher: Wiley, John & Sons, Incorporated
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Chapter 43, Problem 41P
To determine

To calculate:

how long will it take a particular star that is burning its helium to last.

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41 O A star converts all its hydrogen to helium, achieving a 100% helium composition. Next it converts the helium to carbon via the triple-alpha process, "He + He + He → 12C + 7.27 MeV. The mass of the star is 4.6 x 102 kg, and it generates energy at the rate of 5.3 x 1030 W. How long will it take to convert all the helium to carbon at this rate?
The Sun generates energy by p-p proton-proton chain nuclear fusion.  The second step of p-p chain is:                          2H + 1H → 3He. The particle masses are 2.0141 u, 1.0078 u, 3.0160 u, for   2H, 1H, 3He, respectively.  This step produces _____ MeV of energy.
Determine the amount of energy required for the U-238 to dissociate completely into its consistent protons and neutrons. Assume that the mass of the U-238 is 238.05 u, the mass of proton is 1.00727 u, and the mass of neutron is 1.00867 u. Answer Choices: а. 1854 MeV b. 1756 MeV с. 1645 MeV d. 1453 MeV
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