Which of the following statements about spectral types of stars is true?
A) The spectral type of a star can be used to determine its surface temperature.
B) A star with spectral type A is cooler than a star with spectral type B.
C) A star with spectral type F2 is hotter than a star with spectral type F3.
D) The spectral type of a star can be used to determine its color.
E) All of the above are true.
E
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Three point charges, 
and
are located at the vertices of an equilateral triangle. If 
what value must q3 have so that the total potential energy of the arrangement is zero?
A. q1 B. 0.5 q1 C. -0.5 q1 D. (q1+ q2)/2 E. no value will have this result
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What is the relationship between the angular speed ? and the angular acceleration ? of the merry-go-round when the tangential and centripetal accelerations of the child are equal?