Radiation from the Sun reaching Earth (just outside the atmosphe

Radiation from the Sun reaching Earth (just outside the atmosphere) has an intensity of 1.4kW/m2.

(a) Assuming that Earth (and its atmosphere) behaves like a flat disk perpendicular to the Sun's rays and that all the incident energy is absorbed; calculate the force on Earth due to radiation pressure.

(b) For comparison, calculate the force due to the Sun's gravitational attraction.

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