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1. If the period of an unknown planet with mass m is T, what will happen to the planet's period if the planet's mass is

1. If the period of an unknown planet with mass m is T, what will happen to the planet's period if the planet's mass is tripled?

2. Do you think electric force is greater or less than gravitational force? Explain why? Exemplify your answer. Please calculate the electrical and gravitational force between a proton and an electron that are 1nm apart.

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