Answered

A public monument has been commissioned. It is to consist of a cylinder of diameter 5 m and height 0.5 m with another cylinder of diameter 3 m and height 0.5 m centred on it and finally a cone of diameter 0.5 m and height 0.5 m centred on the second cylinder. Concrete has a mass of approximately 2400 kg/m°. (a) Calculate the volume and mass of the concrete required to construct a solid version of this
monument. Express the final answer correct to 1 decimal place. (b) Determine the cost to seal the exposed surface area of the monument using a sealer that covers approximately 10 m' /L and costs $5.70 / L.