ch06-p071 - 71. We may treat all 25 cars as a single object...

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71. We may treat all 25 cars as a single object of mass m = 25 × 5.0 × 10 4 kg and (when the speed is 30 km/h = 8.3 m/s) subject to a friction force equal to f = 25 × 250 × 8.3 = 5.2 × 10 4 N. (a) Along the level track, this object experiences a “forward” force T exerted by the locomotive, so that Newton’s second law leads to 46 5 5.2 10 (1.25 10 )(0.20) 3.0 10 N Tfm a T −= ¡ =×+ × . (b) The free-body diagram is shown next, with
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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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