Only 0.0091% of Earth’s water is fresh water found in lakes and rivers (see figure, USGS, 2019). This corresponds to a volume of about 2.46 x 1016 gallons. If there are 8 x 109 people on Earth, and each person uses 100 gallons of water per day, for how many years will this water last? Give your answer to 3 significant figures in decimal notation. Calculations:
6 . Only 0.0091% of Earth’s water is fresh water found in lakes and rivers (see figure, USGS, 2019). This corresponds to a volume of about 2.46 x 1016 gallons. If there are 8 x 109 people on Earth, and each person uses 100 gallons of water per day, for how many years will this water last?
Give your answer to 3 significant figures in decimal notation.
Calculations:
Answer:
7. Insects can get electrically charged when flying through the air. They can then transfer this charge to plants. A charged flower will induce an opposite charge in the ground through polarization. The flower and the ground form a capacitor separated by the stem. What is the capacitance of such a flower-ground capacitor, given the following:
Give your answer in scientific notation, to two significant figures with the units.
dielectric constant (κ) = 70, permittivity constant (ε0) = 8.85 x 10-12 C2/Nm2, area (A) = 3.14 x 10-4 m2, and separation distance (d) = 0.15 m.
Calculations:
Answer:
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