A tree-trunk may be modelled a cylinder of diameter 30 cm and height 17.1 m. Video from a violent windstorm shows the tree bending so that the top of the tree trunk is shifted horizontally about 0.86 m. Given that wood has a Young's modulus of 50 MPa and a shear modulus of 15 MPa. Determine the force the wind exerts on the tree.

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