960_Physics ProblemsTechnical Physics

960_Physics ProblemsTechnical Physics - Chapter 34 P34.30(a...

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Chapter 34 301 P34.30 (a) If P S is the total power radiated by the Sun, and r E and r M are the radii of the orbits of the planets Earth and Mars, then the intensities of the solar radiation at these planets are: I r E S E = 4 2 π and I r M S M = 4 2 . Thus, II r r ME E M = F H G I K J = × × F H G I K J = 2 11 2 1340 1496 10 577 Wm m 2.28 10 m 2 11 2 ej . . (b) Mars intercepts the power falling on its circular face: MM M IR == × L N M O Q P ππ 26 2 16 577 3 37 10 2 06 10 e j e j m W 2 .. . (c) If Mars behaves as a perfect absorber, it feels pressure P S c I c and force FP A I c R c M M M = = × × 2 16 7 206 10 687 10 . . W 3.00 10 m s N 8 . (d) The attractive gravitational force exerted on Mars by the Sun is F GM M r g SM M ×⋅ × × × 2 11 30 23 11 2 21 6 67 10 1 991 10 6 42 10 228 10 164 10 . . . N m kg kg kg m N 22 e j e j which is ~10 13 times stronger than the repulsive force of part (c). P34.31
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