One light-year (ly) is roughly _____
A) 1010 km
B) 1011 km
C) 1012 km
D) 1013 km
D
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Total lunar eclipses tend to be darkest when the Moon's orbit carries it through the center of the _______________
Fill in the blank(s) with correct word
Addition by 1. Components: The figure shows four vectors, 
, 
, 
, and 
. Vectors 
and 
both have a magnitude of 7.0 cm, and
vectors 
and 
both have a magnitude of 4.0 cm. Find the magnitude and direction of the sum of these four vectors. 
What will be an ideal response?
Good examples of a multicellular organisms which can exist under an enormous range of conditions are
A) tardigrades B) algae C) corals D) molds
Which of the following is an "exchange particle" for the electroweak force?
A) the photon B) the Z particle C) Both of the above. D) the W+ and W- E) All of the above.