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

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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 with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15 . 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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