Berlin Abitur Physics 3. PF (GK) Practice Questions - Berlin Abitur Physics - Third Examination Subject (3. Prüfungsfach, Grundkurs Pool) Exam

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Astronauts aboard the ISS float 'weightlessly', although the Earth's gravity at the ISS altitude is still about 90% of its surface value. What is the correct physical explanation?

The ISS is outside the Earth's gravitational field The atmosphere at that altitude cancels the gravitational force The centrifugal force exactly cancels gravity only at the orbit's center of mass The ISS and its crew are in continuous free fall around the Earth, so no supporting force acts on the astronauts

Correct Answer:

The ISS and its crew are in continuous free fall around the Earth, so no supporting force acts on the astronauts

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