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M2 - Conceptual Q

M2 - Conceptual Q - Name Sharan Multani Name M2 Conceptual...

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Name: Sharan Multani Name: M2 - Conceptual Questions Q1.) The weight of a book was measured using a scale. The scale showed 15N. Next, the book and the scale were placed in an elevator that does not show the floor number. When the elevator started moving the reading of the scale has changed, but later was reading 15N again. Using the fact that the scale shows the same value in the elevator, can you tell if the elevator is moving upward or downward? What kind of information would you need to make that assessment? Please explain. Ans1.) This is an application of Newton's second law to the forces felt in an elevator. If you are accelerating upward you feel heavier, and if you are accelerating downward you feel lighter. If the elevator cable broke, you would feel weightless since both you and the elevator would be accelerating downward at the same rate. Therefore, the scale on which the book is placed shows a different value when the elevator accelerates. We cannot find out whether the elevator is moving up or down unless we know what reading the scale is showing.
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