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1. An astronaut on Planet X knows that its radius is 7.15x106m, but he would like...

1. An astronaut on Planet X knows that its radius is 7.15x106m, but he would like to know its mass. To do this, he constructs a pendulum of length 52.3 cm. He then lets it swing on the surface of the planet, and measures its frequency as 0.361 Hz. What is the mass of Planet X, in kg?  Enter your answer in scientific notation.

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