Unformatted text preview: polymers would exceed that of steel, if exponential growth continued . Material Current consumptions (tonnes years1 ) Projected growth rate in consumption (% year1 ) Iron and Steel 3x10 8 2 Aluminum 4x10 7 3 Polymers 1x10 8 4 2. (1 pt) (a) Explain what is meant by exponential growth in the consumption of a material. (b) A material is consumed at C tonne year1 in 2005. Consumption in 2005 is increasing at r % year1 . If the resource base of the material is Q tones, and consumption continues to increase at r % year1 , show that the resource will be half exhausted after a time 2 1 t , given by + = 1 200 ln 100 2 / 1 C rQ r t...
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 Spring '09
 Asst.Prof.A.FethiOkyar
 Mechanical Engineering, Exponential Function, Aluminium, Steel Aluminum Polymers

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