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InterviewSolution
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An open knife of mass m is dropped from a height h on a wooden floor. If the blade penetrates up to the depth d into the wood. The average resistance offered by the wood to the knife edge is to the depth d into the wood, the average resistance offered by the wood to the knife edge is .A. `mg (1 + (h)/(d))`B. `mg (1 + (h)/(d))^(2)`C. `mg(1-h/d)`D. `mg (1 + /(h))` |
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Answer» Correct Answer - A Decerase in potential energy =Work done against friction `:. Mg (h + d) = F.d` here `F =` average resistance `rArr F =mg(1 + (h)/(d))` |
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