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    • https://phys.libretexts.org/Courses/Joliet_Junior_College/JJC_-_PHYS_110/11%3A_Physlets_-_Interactive_Illustrations_Explorations_and_Problems_for_Introductory_Physics_(Christian_and_Belloni)/11.01%3A_Mechanics/11.1.04%3A_Newton's_Laws/11.1.4.03%3A_Problems
      Determine the general mathematical formula for the normal force the rod exerts on the ball when an arbitrary force is applied to the ball. Write a formula for the scale reading as a function of the ac...Determine the general mathematical formula for the normal force the rod exerts on the ball when an arbitrary force is applied to the ball. Write a formula for the scale reading as a function of the acceleration of the elevator, the mass of the box, and g. Determine the value of the elevator's acceleration that would make the force that the scale exerts on the box vanish In other words, how can the box become apparently "weightless?"

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