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2 years ago

A girl stand 5m away from a large plane mirror.How far must she walk ti be 2m away from her image?

Physics

1 answer:

KonstantinChe [14]2 years ago

4 0

Answer:

Explanation:

If a girl is 5m away from a mirror, she needs to walk a further 3m to be 2m away from her image.

5m-3m = 2m

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962291.57928 m²

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$P_r$ = Pressure = $2\dfrac{I}{c}$ (full reflection)

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P = Power = $3.9\times 10^{26}\ W$

c = Speed of light = $3\times 10^8\ m/s$

M = Mass of Sun = $1.99\times 10^{30}\ kg$

m = Mass of ship = 1500 kg

G = Gravitational constant = 6.67 × 10⁻¹¹ m³/kgs²

Force of radiation is given by

$F_r=P_rA\\\Rightarrow F_r=2\dfrac{I}{c}\times A\\\Rightarrow F_r=2\dfrac{P}{4\pi r^2c} A$

This force will balance the gravitational force as stated in the question

$\dfrac{GMm}{r^2}=2\dfrac{P}{4\pi r^2c} A\\\Rightarrow A=\dfrac{4\pi cGMm}{2P}\\\Rightarrow A=\dfrac{4\times \pi\times 3\times 10^8\times 6.67\times 10^{-11}\times 1.99\times 10^{30}\times 1500}{2\times 3.9\times 10^{26}}\\\Rightarrow A=962291.57928\ m^2$

The area of the must be 962291.57928 m²

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3 years ago

A girl stand 5m away from a large plane mirror.How far must she walk ti be 2m away from her image?​

A girl stand 5m away from a large plane mirror.How far must she walk ti be 2m away from her image?