3 A large crane has a mass of 8500 kg. Fig. 3.1 shows the crane on...

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3 A large crane has a mass of 8500 kg. Fig. 3.1 shows the crane on a muddy building-site. liting-arm hook- axle caterpillar tracks, Fig. 3.1 (a) Calculate the weight of the crane. (b) The crano rests on two catorpillar tracks each of which has a contact aroa with the ground of 3.4m. (1) Calculate the pressure that the crane oxerts on the ground. (i) As the crane drivor walks towards the crane, he starts to sink into the mud. He lays a wido plank of wood on the mud and ho walks along the plank. Explain why he does not sink into the mud when he walks along the plank. 3 A large crane has a mass of 8500 kg. Fig. 3.1 shows the crane on a muddy building-site. liting-arm hook- axle caterpillar tracks, Fig. 3.1 (a) Calculate the weight of the crane. (b) The crano rests on two catorpillar tracks each of which has a contact aroa with the ground of 3.4m. (1) Calculate the pressure that the crane oxerts on the ground. (i) As the crane drivor walks towards the crane, he starts to sink into the mud. He lays a wido plank of wood on the mud and ho walks along the plank. Explain why he does not sink into the mud when he walks along the plank.