b) A modern windmill generates about 1 megawatt of energy, let us say that future ones will generate 10 megawatts per tower. How many of these would be required to meet our energy needs by 2100? The radius of the Earth is 6.4x 106 m. What is its surface area? Land occupies about 30% of the surface of the Earth; what area of land is there? Let us assume that windmills could be placed at a density of four windmills per square kilometer. What fraction of the Earth's land surface would be required to supply this much wind energy?
b) A modern windmill generates about 1 megawatt of energy, let us say that future ones will generate 10 megawatts per tower. How many of these would be required to meet our energy needs by 2100? The radius of the Earth is 6.4x 106 m. What is its surface area? Land occupies about 30% of the surface of the Earth; what area of land is there? Let us assume that windmills could be placed at a density of four windmills per square kilometer. What fraction of the Earth's land surface would be required to supply this much wind energy?
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the value for 2100 is 31.019 TW to use
Transcribed Image Text:b) A modern windmill generates about 1 megawatt of energy, let us say that future ones will
generate 10 megawatts per tower. How many of these would be required to meet our
energy needs by 2100? The radius of the Earth is 6.4x100 m. What is its surface area? Land
occupies about 30% of the surface of the Earth; what area of land is there? Let us assume
that windmills could be placed at a density of four windmills per square kilometer. What
fraction of the Earth's land surface would be required to supply this much wind energy?
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