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{"ops":[{"insert":"This question is about forces and moments of forces.\n\na. (I) Define the moment of\u00a0a force about a point\n(II) State the law of moments as a condition for equilibrium\n\nb. A crane has a jib (AC) of mass 2500kg pivoted at A.\u00a0\nThe jib is supported by a horizontal cable BC. The centre of mass of the jib its at D. The dimensions are as shown on the diagram.\n(I) Make a sketch copy of the diagram and on it draw three arrows to represent the three forces acting on the jib.\n(ii) Calculate the tension in the cable BC.\n\nC. The end of the jib C is raised by shortening BC. Explain whether the tension in BC will increase or decrease.\u00a0\n"}]}
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