A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of 18¬¨¬®‚Äö√†√ª with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15¬¨¬®‚Äö√†√ª. Find the coefficient of static friction between the block and the plank.$

A wooden block is kept on a polished wooden plank and the inclination

1.	A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of 18¬¨¬®‚Äö√†√ª with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15¬¨¬®‚Äö√†√ª. Find the coefficient of static friction between the block and the plank.$
A.	tan 18<sup>0</sup>
B.	tan 15<sup>0</sup>
C.	tan 33<sup>0</sup>
D.	tan 3<sup>0</sup>
Answer» B. tan 15<sup>0</sup>

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