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Chapter 31: Q. 51 (page 903)

The intensity of sunlight reaching the earth is 1360W/m2. Assuming all the sunlight is absorbed, what is the radiation pressure force on the earth? Give your answer (a) in newtons and (b) as a fraction of the sun's gravitational force on the earth.

Short Answer

Expert verified

a. Pressure force in newton is45.3脳10-6N/m2

b. Gravitational force on earth is 3.5脳1022N.

Step by step solution

01

Calculation for pressure force (part a)

a.

Given info:

Intensity is 13600Wm2.

Radiation pressure Pressure鈫�Pradis the force enclosed on an item per unit,

On an object that absorbs all light, the radiation pressure is:

Prad=FA

=PAc

=Ic

Prad=13600Wm23脳108ms

Prad=45.3脳10-6N/m2

02

Calculation for pressure force (part b)

b.

Gravitation force is,

Fg=G脳Me脳Msd2

Fg=6.67脳10-11脳5.98脳1024脳1.98脳1030150脳1092m2

Fg=3.5脳1022N

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