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NOTE: All numbers must be entered as 5000 or 5e3 or 5.0e3 and not with commas as in "5,000" and not as fractions as in "3/4" and not as percentages as in "70%".

1.Estimate a typical wind speed on Earth (in m/s).

2.Estimate the radius of Earth (in meter).

3. Estimate the height (in meter) of Earth's atmosphere above Earth's surface.

4.Using your estimates above, estimate the volume (in meter3) of Earth's atmosphere.

5. Estimate the density of air (in kg/m3).

6. Using your estimates above, estimate the mass (in kg) of Earth's atmosphere.

7.Estimate the kinetic energy (in joule) of Earth's winds.

8. Estimate the global human energy consumption (in joule/day).


9. Estimate the percentage of humanity's daily energy needs that could be met by capturing the energy in Earth's winds.

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