Posted by darren on Monday, November 28, 2011 at 1:03pm.
A 40.6kg crate rests on a horizontal floor, and a 69.1kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.

Phsyics  Henry, Tuesday, November 29, 2011 at 11:36am
a. F = (m1+m2)g,
F = (40.6+69.1)*9.8 = 1075N.
b. F = 1075N.

Phsyics  sarah, Monday, April 2, 2012 at 3:49am
A 110 crate, starting from rest, is pulled across a floor with a constant horizontal force of 380 . For the first 11 the floor is frictionless, and for the next 11 the coefficient of friction is 0.33.What is the final speed of the crate?
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