Homework Help: physics

Posted by Alejandra on Saturday, October 2, 2010 at 2:07pm.

A 3.0 kg block is pushed along a horizontal floor by a force F of magnitude 19 N at an angle θ = 30° with the horizontal. The coefficient of kinetic friction between the block and floor is 0.25.(a) Calculate the magnitude of the frictional force on the block from the floor.(b) Calculate the magnitude of the acceleration of the block.

physics - kast, Sunday, October 3, 2010 at 12:05am
Fnormal= 19sin30+mg=38.9 N
a)friction = u Fnormal = 0.25x38.9 = 9.73 N

b) a =( 19cos30 -Friction)/m
=2.24m/s/s

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