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What are the necessary conditions for planets to go around the sun without falling? Is there...

  1. What are the necessary conditions for planets to go around the sun without falling? Is there a force required? If yes, what kind of force it is and where is the force from?
  2. In the Glass of Wine experiment, what are the necessary conditions for the glass of wine move above head without spilling or falling? Can it happen without the man holding the string hard and pulling the string hard? What is the direction of the force applied on the glass of water when it moves around? Is there any force acting on the satellite when it goes around the earth? What is the force and where is the force from?
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qv velocity i planet sun) f The necessary condition for planets to go around the sun is that there must be a centripetal forcit can not happen without the man holding the string hard and pulling the string hard because if the man doesnt pull it hard

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