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assaftolko
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Is it important that a shuttle surrounds the Earth in an circular orbit in order the astronauts (and the shuttle itself) to have 0 apparent weight and so be considered as in state of apparent weightlessness?
Apparent weightlessness is the sensation of feeling weightless, even though you are still experiencing gravity. This can happen when an object is in a state of free fall, such as an astronaut in orbit around Earth.
Apparent weightlessness is different from true weightlessness because in true weightlessness, there is no gravity acting on an object at all. This can only be achieved in outer space, where there is no significant gravitational pull from any nearby objects.
Apparent weightlessness is caused by the balance of forces acting on an object. In the case of an astronaut in orbit, the gravitational pull from the Earth is balanced by the centrifugal force of the orbiting motion, resulting in the sensation of weightlessness.
Apparent weightlessness is typically measured using a scale or other force measuring device. When an object is in a state of apparent weightlessness, it will register as having no weight on the scale, even though it still has mass.
Long-term exposure to apparent weightlessness can have various effects on the human body, including muscle atrophy, bone loss, and changes in cardiovascular function. Astronauts in space often have to undergo rigorous exercise and medical monitoring to combat these potential effects.