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Tulatalu
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Why a man clearing a bar in a high jump experiences weightlessness?
The man experiences "weightlessness" not only as he clears the bar, but throughout the entire jump after he loses contact with the ground. All bodies in free fall are regarded as experiencing weightlessness. Ironically, within the framework of classical physics, bodies in free fall experiencing "weightlessness" have a single force acting on them, and it is their weight; go figure. Within the framework of general relativity, the picture is much more clear cut, because, in free fall, the force acting on the body is zero as it moves through curved spacetime.Tulatalu said:Why a man clearing a bar in a high jump experiences weightlessness?
Weightlessness during spaceflight is caused by the absence of gravity. In space, objects do not experience the force of gravity as they do on Earth, allowing astronauts and objects to float freely.
Weightlessness can have various effects on the human body, including changes in blood pressure and circulation, muscle atrophy, and bone density loss. These effects can be mitigated through exercise and specialized equipment on spacecraft.
Yes, weightlessness can be simulated on Earth through parabolic flights, where an airplane follows a specific trajectory to create brief periods of weightlessness. This is also known as the "vomit comet" and is often used for astronaut training and scientific research.
The body begins to acclimate to weightlessness immediately, but it can take several days for the body to fully adjust. This is why astronauts often experience some initial discomfort and disorientation when entering space.
Long-term effects of experiencing weightlessness include muscle and bone loss, changes in vision, and potential impacts on the immune system. These effects can be minimized through proper exercise and nutrition, but further research is needed to fully understand the long-term impacts of weightlessness on the human body.