If the Hubble constant is 25 km/s per million light-years, use it to estimate the age of the universe? (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 15 Gy B) 10 Gy C) 20 Gy D) 12 Gy E) 25 Gy
D
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Why does the rotation of our galaxy suggest that it is more massive than previously thought?
What will be an ideal response?
Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
Dana says any vector 
can be represented as the sum of two vectors: 
. Ardis says any vector can be represented as the difference of two vectors: 
. Which one, if either, is correct?
A.
B.
C.
D.
.E.
From Kepler's third law, a hypothetical planet that is twice as far from the Sun as Earth should have a period of
A) 1/2 Earth year. B) more than 2 Earth years. C) 1 Earth year. D) 2 Earth years. E) It depends on the planet's mass.
The force between two bar magnets cannot be due to gravity, because
A) the force between magnets is far too large to be caused by gravity. B) the force between magnets can be repulsive, while gravity must be attractive. C) Both of the above. D) the force of gravity is always downward, unlike the magnetic force. E) All of the above.