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[" A house is built on the top of a hill with "45^(@)" slope.Due "],[" to the sliding of material and sand from top to the bottom "],[" of hill,the slope angle has been reduced."],[" If the coefficient of static friction "],[" between sand particles is "0.75,],[" What is the final angle attained "],[" by hill? (tan' "0.75=37^(@)" ) "],[[" a."8^(@)," b."45^(@)," Fig."7.284],[" ¿A An "^(37^(@))," d."30^(@)]]

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