1.

A chain of length l lies in a pile on the floor and its mass per unit length linearly increases from lambda to 2lambda from end point A to end point B. If its end point A is raised vertically by applying force at a constant speed V_(0). Then

Answer»

The magnitude of force applied F when y = 3l is `(3)/(2)lambda l g`
The magnitude of force applied F when `y=(l)/(2)` is `(5)/(8)lambda lg+(3)/(2)lambda V_(0)^(2)`.
The graph between the applied force and y is PARABOLIC, (before LOOSING the contact)
The graph between the applied force and y is STRAIGHT line. (after loosing the contact)

Answer :A::B::C::D


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