A powerful searchlight shines on a man. The man\'s cross-sectional area is 0.500

Question

A powerful searchlight shines on a man. The man's cross-sectional area is 0.500m2 perpendicular to the light beam, and the intensity of the light at his location is 35.5kW/m2. He is wearing black clothing, so that the light incident on him is totally absorbed. What is the magnitude of the force the light beam exerts on the man? Do you think he could sense the force found in part (A)? The force is large enough to be felt by the man. The force the light beam exerts is much too small to be felt by the man.

Explanation / Answer

F = a*I/c F = 0.5*35000/3x10^8 F = 5.83x10^-5 Newtons B option is the right one

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