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mslena79
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[bQuestion Details:
I am having trouble answering this question.
The drawing shows a block against a vertical wall to its right. The force F is pointed at the lower left hand corner of the block at 40.0 deg. left of -y-axis
The weight of the block in the drawing is 88.9N. The coefficient of the static friction between the block and the vertical wall is 0.560. a)What minimum force F is required to prevent the block from sliding down the wall? b) What minimum force F is required to start the block moving up the wall?
Here is my attempt at it--
a) Fs(max)=(0.560)(88.9N)=49.8N
Fy=88.9N-49.8N=39.1N
Fx=(39.1N)/(cos(40))=51.0N
sqrt{39.1^2+51.0^2}=F
F=64.3N
b) 88.9N +49.8 N=138.7N=Fy
Fx=(138.7N)/(cos(40))=181.06N
sqrt{138.7^2+181.06^2}=F
F=228N
But it doesn't seem right!
I am having trouble answering this question.
The drawing shows a block against a vertical wall to its right. The force F is pointed at the lower left hand corner of the block at 40.0 deg. left of -y-axis
The weight of the block in the drawing is 88.9N. The coefficient of the static friction between the block and the vertical wall is 0.560. a)What minimum force F is required to prevent the block from sliding down the wall? b) What minimum force F is required to start the block moving up the wall?
Here is my attempt at it--
a) Fs(max)=(0.560)(88.9N)=49.8N
Fy=88.9N-49.8N=39.1N
Fx=(39.1N)/(cos(40))=51.0N
sqrt{39.1^2+51.0^2}=F
F=64.3N
b) 88.9N +49.8 N=138.7N=Fy
Fx=(138.7N)/(cos(40))=181.06N
sqrt{138.7^2+181.06^2}=F
F=228N
But it doesn't seem right!