A 3.0-kg block is at rest on a horizontal floor. If you push horizontally on the 3.0-kg

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A 3.0-kg block is at rest on a horizontal floor. If you push horizontally on the 3.0-kg block with a force of 12.0 N, it just starts to move.
(a) What is the coefficient of static friction?
(b) A 7.0-kg block is stacked on top of the 3.0-kg block. What is the magnitude F of the force, acting horizontally on the 3.0-kg block as before that is required to make the two blocks start to move?
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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