For backfill with sloping surface, the coefficient of active earth pre – McqOptions

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1.	For backfill with sloping surface, the coefficient of active earth pressure is given by ______
A.	(K_a= frac{ sqrt{cos^2 -cos^2 }}{cos + sqrt{cos^2 -cos^2 }} )
B.	(K_a= frac{cos + sqrt{cos^2 -cos^2 }}{cos - sqrt{cos^2 -cos^2 }} )
C.	(K_a= frac{cos - sqrt{cos^2 -cos^2 }}{cos + sqrt{cos^2 -cos^2 }} )
D.	(K_a=cos frac{cos - sqrt{cos^2 -cos^2 }}{cos + sqrt{cos^2 -cos^2 }} )
Answer» E.

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