1 m2 of the surface of our planet receives energy from the direct rays of the Sun every day, which is approximately equal to 1 kW

1 m2 of the surface of our planet receives energy from the direct rays of the Sun every day, which is approximately equal to 1 kW. Calculate the energy received by the Sahara Desert per year if its area is 7 million km2. The number of sunny days per year is 300.

1) For 1 day, 1 m2 of the Earth’s surface receives 1 kW of energy, which means for 300 days 1 m2 of the Sahara will receive 300 kW of energy.
300 kW = 3 × 10 ^ 2 kW
2) 1 km2 = 1,000,000 m2 = 1 × 10 ^ 6 m2
3) The area of the Sahara is 7,000,000 km2 = 7 × 10 ^ 6 km2 = 7 × 10 ^ 12 m2
4) 7 × 10 ^ 12 m2 × 3 × 10 ^ 2 kW = 21 × 10 ^ 14 kW of energy – Sugar will receive in a year
Answer: the Sahara receives 21 × 10 ^ 14 kW of energy per year.

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