Midterm Solutions

# 11 arcsecondsyear for barnards star you can estimate

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Unformatted text preview: r C was accepted (c) What is the current phase of the Moon? If you choose crescent or gibbous, be sure to indicate whether it is wanning or waxing. New or Wanning Crescent. A hint from class: our originally scheduled night lab on Friday 10/18 was a lunar eclipse, and hence a full moon; 2 weeks later is ½ of the lunar cycle (d) What is the fastest proper motion measured for a star in arcseconds/year, and what star is it? 11 arcseconds/year for Barnard’s Star. You can estimate this by assuming stars move around 50 km/s and nearby stars are rough 5 pc away, so µ = Vtan/4.74d = 2 arcseconds/yr would have been a good guess (e) Around what element or proton number do you cease gaining energy through fusion? Iron, or Z = 26; this is the peak of the binding energy curve Page 3 of 16 Physics 160 Fall 2013 Midterm Exam Part 2:...
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## This document was uploaded on 02/26/2014 for the course PHYS 160 at UCSD.

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