The spaceship Intergalactica lands on the surface of the uninhabited Pink Planet

Question

The spaceship Intergalactica lands on the surface of the uninhabited Pink Planet, which orbits a rather average star in the distant Garbanzo Galaxy. A scouting party sets out to explore. The party's leader–a physicist, naturally–immediately makes a determination of the acceleration due to gravity on the Pink Planet's surface by means of a simple pendulum of length 1.31 m. She sets the pendulum swinging, and her collaborators carefully count 106 complete cycles of oscillation during 205 s. What is the result?

Explanation / Answer

T = 2*pi*sqroot(l/g)
l = 1.31 m
T = 205/106
so, g = 13.81 m/s/s

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