ch12-p048 - 48. Since the force is (stress area) and the...

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12 2 3 8 2 5 (graph area) (8.0 10 m )(8.0 10 m)(4.74 10 N/m ) 3.03 10 J. KW A L −− == = × × × = × (b) The kinetic energy of the fruit fly of mass 6.00 mg and speed 1.70 m/s is 26 2 6 11 (6.00 10 kg)(1.70 m/s) 8.67 10 J. 22 ff f Km v ==× = × (c) Since f KW < , the fruit fly will not be able to break the thread. (d) The kinetic energy of a bumble bee of mass 0.388 g and speed 0.420 m/s is 242 5 (3.99 10 kg)0.420 m/s) 3.42 10 J. bb b v = × (e) On the other hand, since b > , the bumble bee will be able to break the thread. 48. Since the force is (stress × area) and the displacement is (strain × length), we can write the work integral (eq. 7-32) as W = Fdx ³ = (stress)
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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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