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meep26wesley
High School
The ISS orbits the Earth at approximately 400,000m altitude. Its mass is 419725 kg. The Earth’s average radius and mass are 6.38e6m and 5.97e24kg. What is the orbital velocity of the International Space Station?
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skyluke89
Answer:
7.66 km/s
Explanation:
The force of gravity between the Earth and the ISS corresponds to the centripetal force that keeps the ISS in circular motion around the Earth:
where
is the gravitational constant
is the mass of the ISS
is the mass of the Earth
is the distance between the ISS and the Earth's centre (given by the sum of the Earth's radius, r, and the ISS altitude, h)
is the orbital velocity of the ISS
Re-arranging the equation and substituting numbers, we find the orbital velocity:
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