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bearhunter [10]
2 years ago
5

How did Ghana and Mali become powerful West Africa Empires?

Geography
1 answer:
irakobra [83]2 years ago
7 0

Protected by a well-trained, imperial army and profiting from being within the middle of trade routes, Mali distended its territory, influence, and culture over the course of 4 centuries. Associate in Nursing abundance of Au and salt deposits helped to expand the empire's industrial assets.

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it is possible for two stars to have different temperatures and different sizes but the same luminosity. explain how.
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Answer:

Two stars (a and b) can have the same luminosity, but different surface area and temperature if the following condition is met:

(T_a^4)(R_a^2) = (T_b^4)(R_b^2)

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L_b = σ(T_b^4)(4πR_b^2)

you can assume that L_a and L_b are equal:

σ(T_a^4)(4πR_a^2) = σ(T_b^4)(4πR_b^2)

Now, you can cancel the constants:

(T_a^4)(R_a^2) = (T_b^4)(R_b^2)

as long as this relation between a and b is true, then the luminosity can be the same.

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