1 Fig. 1 shows a pile of four uniform blocks in equilibrium on a horizontal table. Their masses, as shown, are \(4 \mathrm {~kg} , 5 \mathrm {~kg} , 7 \mathrm {~kg}\) and 10 kg .
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\caption{Fig. 1}
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Mark on the diagram the magnitude and direction of each of the forces acting on the 7 kg block.