ch08-p072 - 72. (a) At B the speed is (from Eq. 8-17) 2 v =...

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if d < L . With μ k = 0.70, we find d = 9.3 m, which is indeed less than L (given in the problem as 12 m). We conclude that the block stops before passing out of the “rough” region (and thus does not arrive at point D ). 72. (a) At B the speed is (from Eq. 8-17) 22 2 01 2 (7.0 m/s) 2(9.8 m/s )(6.0 m) 13 m/s. vv g h =+ = + = (a) Here what matters is the difference in heights (between A and C ): 2 2 2 ( ) (7.0 m/s) 2(9.8 m/s )(4.0 m) 11.29 m/s 11m/s. g h h = + = (c) Using the result from part (b), we see that its kinetic energy right at the beginning of
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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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