• The free-fall acceleration on Mars is 3.7 m/s.
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• (a) What length of pendulum has a period of 1.2 s on Earth? 
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•  (b) What length of pendulum would have a 1.2-s period on Mars? An object is suspended from a spring with force constant 10 N/m. 
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• (c) Find the mass suspended from this spring that would result in a period of 1.2 s on Earth. 
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•  (d) Find the mass suspended from this spring that would result in a period of 1.2 s on Mars.