Homework Help: science

Posted by anonymous on Monday, January 10, 2011 at 11:00pm.

table is lifted to backpack starts to slide off. If table makes a 21 degree angle with floor, what is coefficient of static friction between backpack and the table?

science - drwls, Tuesday, January 11, 2011 at 3:38am
(mu_s)*M*g cos 21 = M*g*sin 21

mu_s = sin21/cos21 = tan21 = 0.384
is the static coefficient of friction

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