The faintest star visible to the naked eye has an apparent visual magnitude of about
A) 10.
B) 6.
C) 1.
D) 0.
E) -6.
B
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One of the discoveries made by the Voyager probes while near Jupiter was
A) Io has a featureless surface that never changes. B) a thin ring of dust around the equator. C) the absence of a magnetic field around the giant planet. D) that the Great Red Spot is uniform and featureless. E) each of the four large moons produces a strong magnetic field.
Which of the following is thought to be a black hole?
a. Gleise 229B b. Sirius B c. Orion Nebula d. Cygnus X-1
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. 
According to Newton's first law, if a body is moving in the absence of any net external force, describe the continuing motion of the object
What will be an ideal response?