ch06-p011 - 11. We denote the magnitude of 110 N force...

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11. We denote the magnitude of 110 N force exerted by the worker on the crate as F . The magnitude of the static frictional force can vary between zero and ,max s sN f F μ = . (a) In this case, application of Newton’s second law in the vertical direction yields N Fm g = . Thus, () ( ) 22 0.37 35kg (9.8m /s ) 1.3 10 N ss N s fF m g μμ === = × which is greater than F . (b) The block, which is initially at rest, stays at rest since F < f s , max . Thus, it does not move. (c) By applying Newton’s second law to the horizontal direction, that the magnitude of the frictional force exerted on the crate is 2 1.1 10 N s f . (d) Denoting the upward force exerted by the second worker as F 2 , then application of Newton’s second law in the vertical direction yields
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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