The cable of a uniformly loaded suspension bridge hangs in the form of a parabola. The road way which is horizontal and 100m long is supported by vertical wires attached to the cable, the longest wire being 30m and the shortest being 6m. Find the length of a supporting wire attached to the road way 18m from the middle.
A cuboid of dimensions 70 cm by 50 cm by 30 cm has "square holes" measuring 10 cm by 10 cm in the centres of the faces of the cuboid. the holes cut through the length of each face of the solid. calculate the volume and the surface area of the solid?