How do we estimate the surface temperature of a star?
A) by measuring the Doppler shifts of absorption lines in its chromosphere
B) by obtaining its spectrum and classifying the spectral type
C) by estimating its parallax
D) by estimating its luminosity
B) by obtaining its spectrum and classifying the spectral type
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Two objects of the same mass move along the same line in opposite directions
The first mass is moving with speed v. The objects collide, stick together, and move with speed 0.100v in the direction of the velocity of the first mass before the collision. What was the speed of the second mass before the collision? A) 1.20v B) 10.0v C) 0.900v D) 0.800v E) 0.00v
Heat is thermal energy that matter
A) contains. B) transfers. C) both of these D) none of the above
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Answer the following statement true (T) or false (F)
At what angle above the horizon would the sun appear if its reflected light from a lake, viewed at the same time, were completely polarized? (n water = 1.333)
A. 53.12 
B. 36.88 
C. 48.75
D. 41.25
E. 23.52