Retrograde motion (east to west among the stars) is observed
a. for some planets as Earth passes between that planet and the Sun.
b. for the Sun during the entire year.
c. for Earth's Moon during an entire month.
d. None of the other choices are correct.
a
Physics & Space Science
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The average star spends ________ of its lifetime on the main sequence
a. 1% b. 2% c. 10% d. 20% e. 90%
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A small hole is cut in the bottom of a water storage tank. The initial depth of the water is 8.00 m. If the diameter of the small hole in the bottom of the tank is 1.00 cm, then what is the flow rate of the water leaving the tank?
a. 
b. 
c. 
d. 
e. 
Physics & Space Science
The__________of the Sun is visible during an annular eclipse
A) photosphere B) solar flare C) sun spots D) rotation
Physics & Space Science
What is the magnitude of the magnetic field at point P if a = R and b = 2R?
A.
B.
C.
D.
E.
Physics & Space Science