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A flexible chain of mass m hangs between two fixed points A and B at the same level. The inclination of the chain with the horizontal at the two points of support is θ. The tension at the midpoint C of the chain isA. mg /tanθB. 2 tanθC. ZeroD. mg sinθ+cosθ/2
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A heavy string of mass m hangs between two fixed points A and B at the same level. The tangents to the string at A and B are at an angle θ with the horizontal as shown in the figure. The tension in the string at lowest point isA. mg /2 sinB. coșC.D. ulg /2 θ
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9702/23/O/N/18© UCLES 2018Answerallthe questions in the spaces provided.1(a)Mass, length and time are all SIbase quantities.State two other SIbase quantities.1................................................................................................................................................2................................................................................................................................................[2](b)A wire hangs between two fixed points, as shown in Fig. 1.1.17°150N150Ntyrefixedpointfixedpointwirehookrope17°horizontalFig. 1.1(not to scale)A child’s swing is made by connecting a car tyre to the wire using a rope and a hook. Thesystem is in equilibrium with the wire hanging at an angle of 17° to the horizontal. The tensionin the wire is 150 N. Assume that the rope and hook have negligible weight.(i)Determine the weight of the tyre.weight =.......................................................N [2]