A star of absolute magnitude 1 is about 2.51 times more luminous than a star of absolute magnitude 2.
Answer the following statement true (T) or false (F)
True
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An object moving at a constant speed requires 6.0 s to go once around a circle with a diameter of 4.0 m. What is the magnitude of the instantaneous acceleration of the particle during this time?
a. 2.2 m/s2 b. 2.7 m/s2 c. 3.3 m/s2 d. 3.8 m/s2 e. 4.4 m/s2
Which are more massive, the black holes in X-ray binaries or those at the centers of galaxies?
A: Black holes in X-ray binaries are more massive. B: Black holes in the centers of galaxies are more massive.
On a cosmic calendar, in which the history of the universe is compressed into 1 year, when did Kepler and Galileo first discover that we live on a planet in solar system
a) December 17 b)September 3 c) 1 second ago
If a 20 W laser beam, which has an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m, what is the initial intensity of the beam?
a. 
b. 
c. 
d. 
e. 