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An insect crawls up a hemispherical surf...

An insect crawls up a hemispherical surface as shown (see the figure) the coefficient offriction between the insect and the surface is 1/3. If the line joining the centre of the hemisperical surface to the insect makes an angle `theta` with the vertical, the maximum possible value of `theta` is given by

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`cot^(-1)3`
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