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A 150 cm long glass tube, closed at both...

A 150 cm long glass tube, closed at both ends, is filled with leads marbles up to a length of 30 cm. After how many inversions of the tube will the temperature of the lead marbles increase by `2^(@)C`? Specific heat of lead `= 0.03 cal cdot g^(-1) cdot^(@)C^(-1)`.

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