Which statement best describes Phobos and Deimos?
a. small satellites, irregular in shape and heavily cratered
b. large satellites, spherical in shape with smooth surfaces
c. small satellites, spherical in shape with smooth surface
d. one large and one small satellite, irregular in shape with lava flows
e. large satellites, irregular in shape and heavily cratered
a
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A mass hanging from the end of a spring has a phase rate of 
= 6.3 s–1 ? 1 cycle/s. Let’s define t = 0 to be when the mass passes x = 0 going up. If its speed as it passes is 1.0 m/s, what is its amplitude A?
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