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Calculation to shear tree:
Area of the tree cut: pi*r2 (diameter / cos(30 degrees) / 2)
Small Tree: 0.091421...(rounded to 0.09142m2)
Big Tree: 1.462738... (rounded to 1.46274m2)
0.09142m2 x 5,500,000 Pa x 0.6 = 301,686 Newtons
1.46274m2 x 5,500,000 Pa x 0.6 = 4,827,042 Newtons
As the entire diameter of the tree was sheared, this is what the force is multiplied by as the entire cut needs to follow through the entire diameter of the tree despite slowing down due to the friction caused by the wood during cutting:
Small Tree: 301,686N x .3175m = 95,785.305 Joules (Wall level)
Big Tree: 4,827,042N x 1.27m = 6,130,343.24 Joules (Wall level)