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The magnitude of the tidal force between the International Space Station (ISS) and a nearby astronaut...

The magnitude of the tidal force between the International Space Station (ISS) and a nearby astronaut on a spacewalk is approximately 2GmMa/r3 . In this expression, M is the mass of the Earth, r=6.79×106m is the distance from the center of the Earth to the orbit of the ISS, m=125kg is the mass of the astronaut, and a=20m is the distance from the astronaut to the center of mass of the ISS.

Calculate the force of gravitational attraction between the astronaut and the ISS if they are 20 m apart and the ISS has a mass of 420,000 kg.

Express your answer to two significant figures and include appropriate units.

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