If \(\theta\) is equal to \(\alpha\) at the time the box is just about to...

WAEC 1998

If \(\theta\) is equal to \(\alpha\) at the time the box is just about to slide down the plank, the coefficient of static friction between the plank and box is

A. sin\(\alpha\)
B. cos\(\alpha\)
C. tan\(\alpha\)
D. sec\(\alpha\)
E. cot\(\alpha\)

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Correct Answer: Option C

Explanation

\(\mu = \frac{F}{R} = \frac{W sin \theta}{W cos q}\)

= tan\(\theta\)

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If \(\theta\) is equal to \(\alpha\) at the time the box is just about to...

Correct Answer: Option C

Explanation

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