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The angle of repose between a block and an incline is 30°. The coefficient of static friction is:
Atan 30° = 0.577
Bsin 30° = 0.5
Ccos 30° = 0.866
D0.3
Answer & Solution
Correct answer: A. tan 30° = 0.577
At angle of repose, μ_s = tan φ. For φ = 30°: μ_s = tan 30° = 1/√3 ≈ 0.577.
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