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Sagot :
Answer:
F = 2.65 10⁻¹¹ N
Explanation:
The radiation pressure for a fully reflective surface is
P = 2S / c
where S is the pointiing vector which is the energy per unit area,
S = I = [tex]\frac{\ P_{prom} }{A}[/tex]
the area of a circle is
A = π r² = π d²/4
S = [tex]\frac{3.98 \ 10^{-3} }{ \frac{\pi \ 0.003^2 }{4} }[/tex]
S = 0.563 10⁻³ W / m2
let's calculate the pressure
P = 2 0.563 10⁻³/3 108
P = 0.3753 10⁻⁵ N / m²
this pressure exerts an upward force, the definition of pressures
P = F / A
F = P A
let's calculate
F = 0.3753 10-5 π / 4 0.003²
F = 2.65 10⁻¹¹ N
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