According to Kepler's third law, the square of the planet's period in years is
A) equal to its perihelion distance from the Sun in AU.
B) inversely proportional to its mass in kilograms.
C) equal to the fourth power of its average temperature in degrees Kelvin.
D) proportional to the cube of its semimajor axis in AU.
E) equal to the square of its aphelion distance in AU.
D
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Life emerged from the oceans about _________ billion years ago
Fill in the blank(s) with correct word
The position of an object is given by 
where t is in seconds. At t = 2.0 s, what is the magnitude of the particle's acceleration?
A. 0 m/s2 B. 2.0 m/s2 C. 17 m/s2 D. 36 m/s2 E. 72 m/s2
In the chemical formula for water, H2O, what does the "2" mean?
a. There are two oxygen (O) atoms in a molecule of water. b. There are two hydrogen (H) atoms in a molecule of water. c. The hydrogen in water is actually deuterium. d. none of the above
The electric field at point P due to a point charge Q a distance R away from P has magnitude E. In order to double the magnitude of the field at P, you could
A) double the distance to 2R. B) double the charge to 2Q. C) reduce the distance to R/2. D) reduce the distance to R/4. E) double the charge to 2Q and at the same time reduce the distance to R/2.