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The end of a chain of length L and mass per unit length `rho`, which is piled up on a horizontally platform is lifted vertically with a constant velocity u by a variable force F. Find F as a function of height x of the end above platform:A. `rho (gx + 2u^(2))`B. `rho (2 gx + rho u^(2))`C. `rho (gx + u^(2))`D. `rho (u^(2) - gx)` |
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Answer» Correct Answer - C Force is rate of change of momentum in chain plus the weight of chain at x `F = rho xg + rho u^(2)` |
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