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
Attached Figure / Diagram
A
sin\(\alpha\)
B
cos\(\alpha\)
C
tan\(\alpha\)
D
sec\(\alpha\)
E
cot\(\alpha\)
Verified Correct Answer: C.
Physical Principles & Numerical Solution
\(\mu = \frac{F}{R} = \frac{W sin \theta}{W cos q}\)
= tan\(\theta\)
Source: Myschool Past Questions Archive (Record #33516)