A mass hangs on a spring held in a physicist's hand. When the mass is pulled down and then released, it oscillates with a period of 2.0 s. This system is taken to the Moon, where the acceleration of gravity is less. The spring on the Moon is held in an astronaut's hand, and the mass, when pulled down and released, will
A. oscillate with a shorter period.
B. oscillate with a longer period.
C. not oscillate at all.
D. oscillate with an unchanged period.
Answer: D
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