Homework Help: physics

Posted by johnny on Thursday, December 11, 2008 at 9:54pm.

The floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.20 with the floor. If the train is initially moving at a speed of 47 km/h, in how short a distance can the train be stopped at constant acceleration without causing the crates to slide over the floor?

physics - drwls, Friday, December 12, 2008 at 6:42am
47 km/h = 13.056 m/s

Compute the acceleration(a)when the stopping distance is X meters:

V^2 = 170.44 m^2/s^2 = 2 a X
a = V^2/(2X) = 85.22/X

M g * us = M a when a is as high as possible without slipping

M's cancel. You know the static fricion coefficient us. Substitute for a and solve for X
physics - billy, Thursday, March 7, 2013 at 5:02pm
87m

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