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pooface
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Homework Statement
two boards of length 5m and 8m are hinged together and the hinge supported 4m above the ground, thus forming a double inclined plane 13m long measured along the slopes. Two blocks of equal weight are placed on the boards and connected by a cord passing over a frictionless pulley at the apex. If the coefficent of friction between blocks and boards is 0.3
a) show that the system is in equilibrium.
http://img525.imageshack.us/img525/3209/q10fs0.jpg diagram
Homework Equations
The Attempt at a Solution
Block A: The left one.
FN=mgcos53.13deg
Frictionforce=mgcos53.15deg*(0.3)
=0.18mg
Force=mgsin53.13deg
=0.8mg
Block B: The right one.
FN=mgcos30deg
Frictionforce=mgcos30deg*(0.3)
=0.2598mg
Force=mgsin30deg
=0.5mg
If these calculations are correct then I don't see how they are in equilibrium.
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