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veronicak5678
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Homework Statement
A 10 kg plank leans against a frictionless wall and floor at an angle of 60 degrees with the horizontal. A horizontal rope connects the center of mass of this uniform plank with the wall.
a- Use dynamics to find the normal force between the floor and the plank.
b- Find the normal force between the wall and the plank.
c- Determine the tension in the rope.
d- Show the net torque is zero when the pivot is located where the plank meets the wall.
Homework Equations
torque = Fsin(phi) radius
The Attempt at a Solution
a- normal floor = weight = 10kg (9.8) = 98 N
b- Using torque, I end up with -56.6.
-torque of normal floor + torque of normal wall = 0
98 N (sin 210) length/2 = normal wall (sin 120) length /2
normal wall = -56.6
What am I doing wrong?
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