The moon's velocity is directed
A) zero.
B) backward, opposite to its direction of motion.
C) forward, along its direction of motion.
D) inward, toward the center of Earth.
E) outward, away from Earth.
C
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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
The combining of two nuclei to form a larger nucleus with the release of energy is
a. nuclear fission b. nuclear fusion c. neutron activation d. nuclear emission e. beta decay
Which of the following objects may have organic particles on its surface as a result of the interaction of sunlight with methane in its upper atmosphere?
a. Io b. Titan c. Mimas d. Ganymede e. Callisto
The basic requirement for metabolism inside cells is
A) a source of carbon and a source of energy B) a source of carbon only C) a source of energy only D) the presence of ATP