So which is closer?
A: Menkent
B: Hadar
C: Can't tell
Ans: A: Menkent
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Nuclear Binding Energy: In massive stars, three helium nuclei fuse together, forming a carbon nucleus, and this reaction heats the core of the star. The net mass of the three helium nuclei must therefore be
A. higher than that of the carbon nucleus. B. less than that of the carbon nucleus. C. the same as that of the carbon nucleus because mass is always conserved. D. the same as that of the carbon nucleus because energy is always conserved.
Mass can be considered concentrated at the center of mass for rotational motion
Indicate whether the statement is true or false
For a high-temperature gas turbine application, you have chosen to use alumina ceramic material for a non-rotating part that is subject to modest forces. You find that you can save a significant amount of money by buying alumina that is of 1% lower density than more-expensive alumina, and in aircraft design saving weight is always desired. What aspect of the defect structure of the cheaper alumina should you investigate to determine its possible effects on mechanical properties, and why may this be important?
What will be an ideal response?
In the hypothetical atomic interaction shown in figure C9.13, if the system had the appropriate total energy and initial position, could the atoms’ separation remain stable and constant?
A. No
B. Yes, at a separation of about 0.12 nm
C. Yes, at a separation of about 0.25 nm
D. Yes, at a separation of either about 0.12 nm or 0.25 nm
E. Yes, at some other separation(s) (specify)