InterviewSolution
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InterviewSolution
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Masses `M_1`, `M_2` and `M_3` are connected by strings of negligible mass which pass over massless and friction less pulleys `P_1` and `P_2` as shown in fig The masses move such that the portion of the string between `P_1` and `P_2` in parallel to the inclined plane and the portion of the string between `P_2` and `M_3` is horizontal. The masses `M_2` and `M_3` are 4.0kg each and the coefficient of kinetic friction between the masses and the surfaces is 0.25. The inclined plane makes an angle of `37^@` with the horizontal. If the mass `M_1` moves downwards with a uniform velocity, find (i) the mass of `M_1` (ii) The tension in the horizontal portion of the string `(g=9.8 m//sec^2, sin 37^@=3//5)` |
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Answer» Correct Answer - B::D (a) If `M_1`, `M_2` and `M_3` are considered as a system, then the force responsible to more them is `M_1g` and the retarding force is `(M_2gsintheta+muM_2gcostheta+muM_3g)`. These two should be equal as the system is moving with constant velocity. |
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