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The Earth rotates steadily, even though we cannot see or feel it, what if the Earth suddenly stops rotating?
And if the spinning stops, the angular momentum of every object on Earth will tear the surface apart, resulting in a very bad day.
“This is just a thought experiment,” said James Zimpelman, chief geologist emeritus at the Smithsonian’s National Air and Space Museum in Washington, DC. “He’s been touring since his training, which is impressive.”
The Earth rotates completely on its axis every 23 hours 56 minutes 4.09053 seconds. And if the planet suddenly came to a stop, the angular momentum transmitted to air, water, and even rocks along the equator would continue to move at that speed of 1,100 miles per hour. The movement will sweep across the surface, tearing apart and sending fragments to the upper regions of the atmosphere and space.
What is angular momentum?
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There is so-called linear dynamics, which is the product of the mass and speed of an object, because the passenger of a moving car that suddenly stops will continue to move forward due to linear dynamics.
Angular momentum is a rotational analogue of linear moment and is a product of moment of inertia (the rotational force required to rotate mass) and angular velocity.
“One of the fundamentals of physics is the conservation of angular momentum,” Zimpelman told Live Science. “Once something turns, you have to apply the same force. [في الاتجاه المعاكس] to prevent it from spinning.
The pieces that broke off the surface would regain some rotation as the Earth and its remains continued their way around the sun, Zimpelman explained. Eventually, the planet’s gravitational pull will bring the halo of the shrapnel together with an unexpected effect.
“What Isaac Newton helped us discover using classical mechanics is that pieces that stack up and come together release some of their energy, heating things up,” Zimpelman said.
Think of it as a meteor trail across the sky, where remnants that have found themselves in remote regions of the atmosphere and outer space will be drawn to the surface by the planet’s gravitational pull, releasing energy on impact. The constant bombardment of these pieces, Zimpelman said, would turn the crust into an “ocean of molten rock.” Eventually, the colliding fragments will be sucked into the molten sea by a process called accretion.
The rapid and destructive transformation would also evaporate most of the water on the planet’s surface, Zimpelman said. While most of this evaporated water will be lost, some can be incorporated into newly solid minerals, such as olivine. Finally, not all parts will be absorbed by the build-up. Parts of the planets will be swept by the moon’s gravitational force, bombarding the nearby satellite and creating countless craters on its surface.
Source: Sciences en direct
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