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Nature of Surfaces in Contact

A person has ...

Question

A person has applied some mustard oil on his hands. Which of the following objects will become most difficult for him to hold in his hand?
(a) Earthen cup(kulhar)
(b) thermocol tumbler
(c) glass tumbler
(d) wooden cup

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Solution

(c) glass tumbler

Beacuse all other objects have greater frictional coefficient than glass

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