An insect crawls up a hemispherical surface very slowly. The coefficient of friction between the insect and the surface is 1/3. If the line joining the center of the hemispherical surface to the insect makes the angle α with the vertical, the maximum possible value of α is given by
(a) cotα=3
(b) tanα=3
(c) secα=3
(d) cosecα=3.
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a is the correct answer.
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