A block just begins to slide down an incline when the angle of inclination is 30°. The coefficient of static friction between block and incline is:
A0.87
B0.50
C0.58
D1.73
Answer & Solution
Correct answer: C. 0.58
At the verge of sliding the angle equals the angle of repose: tan θ = μs, so μs = tan 30° = 0.577 ≈ 0.58.
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