Question

1.Insolation at the top of the atmosphere is about 1367 W/m2. Earth's diameter is 12,756 km. The total radiation received by our planet is____Watts

2.Global annual power consumption is about 12.7 x 1012 watts. Earth's 2017 human population is about 7.5 billion. The power consumption per person is

----kW.

3.Given that the density of the oceanic crust Perust = 2.99 and the crustal thickness is about z= 8.4 km, the pressure at the crust | upper mantle boundary is

-----kPa.

Answer #1

1. Earth's sphere provides a circular disc of area in front of the sun, where d is the earth's diameter. Considering atmospheric height to be neglible (around 100 km) compared to earth's radius, we can roughly calculate the total radiation received by our planet per second as

2. Global annual consumption=12.7 X 10^{12} watts.

Human population = 7.5 X 10^{9}

So roughly, power consumption per person is 12.7 X
10^{12} watts/7.5 X 10^{9} = 1.6933 X
10^{3} watts = 1.6933 kW.

3. Pressure at the crust P =density*depth*g=2.99 g/cc*8.4
km*9.81 m/s^{2}=

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