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As shown, a 5 meter long plank of wood with a mass of 20kg is placed across two

ID: 2256423 • Letter: A

Question

As shown, a 5 meter long plank of wood with a mass of 20kg is placed across two concrete columns.  A man pulls down on the end of this piece of wood exerting a force F.  What is the magnitude of this force F at which the plank of wood would begin to tip over?


As shown, a 5 meter long plank of wood with a mass of 20kg is placed across two concrete columns. A man pulls down on the end of this piece of wood exerting a force F. What is the magnitude of this force F at which the plank of wood would begin to tip over?

Explanation / Answer

3*20*9.8-2.5*20*9.8=f*5

F = 19.6 N