A1261906204LmcXt

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Test 3

• 1) Starting the Test
• Make sure your test is a different color than the
  person sitting next to you
• Fill out and bubble the following information
• Name gt Last name, space, first name and test
  version (last space)
• W gt White, B gt Blue, G gt Green, Y Yellow
• Birth Date gt Todays date November 17, 2009
• ID gt Banner ID
• 2) During the Test
• Draw simple sketches to help visualize problems
• Solve numerical problems in the margin
• Come up with your answer first, then look for it
  in the choices
• If you cant find the answer, try process of
  elimination
• If you dont know the answer, Go on to the next
  problem and come back to this one later
• TAKE YOUR TIME, dont hurry
• If you dont understand something, ask me.

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Test 3 Useful Equations
parallactic distance d 1/p where p is
parallax in arcsec and
d is in parsecs
Schwarschild Radius
2 GM c2
R
Lifetimes of stars (on the main sequence)
L 1010/M2 years where M is
the Mass in solar masses
and L is the Lifetime

• Equivalence of Matter and Energy E mc2
• Luminosity ? apparent brightness x
  (distance) 2