The total average power emitted by the Sun is P. A satellite with mass M is at a

Question

The total average power emitted by the Sun is P. A satellite with mass M is at a distance R from the center of the Sun and has solar panels with total area A placed perpendicular to the Sun-Satellite direction. Assuming that the panels have 100% absorption efficiency,

Find the intensity of Sun-light at the position of the Satellite;

Find the total power absorbed by the Satellite;

Find the total force exerted by the Sun on the Satellite.

The total average power emitted by the Sun is P. A satellite with mass M is at a distance R from the center of the Sun and has solar panels with total area A placed perpendicular to the Sun-Satellite direction. Assuming that the panels have 100% absorption efficiency, Find the intensity of Sun-light at the position of the Satellite; Find the total power absorbed by the Satellite; Find the total force exerted by the Sun on the Satellite.

Explanation / Answer

1. intencity = power/ spreading area

I = P/(4*pi*r^2)

2. total power absorbed = Intencity*area of satalite*absorption efficiency

absorption efficiency = 100% = 1

so

total power absorbed = P*A/(4*pi*r^2)

3. force = GMm/r^2 - P*A/(c*(4*pi*r^2))

F = GMm/r^2 - IA/c

m = mass of sun

M = mass of satalight

c = speed of light

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