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Q.

A heavy block kept on a frictionless surface is in equilibrium and being pulled by two ropes of equal mass m. At t = 0, the force on the left rope is withdrawn but the force on the right end continues to act. Let F₁ and F₂ be the magnitudes of the forces by the right rope and the left rope on the block respectively.

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a

F₁ < F, F₂ = F for t < 0

b

F₁ = F, F₂ < F for t < 0

c

F₁ = F₂ = F for t < 0

d

F₁ = F₂ = F + mg for t < 0

answer is A.

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Detailed Solution

For t<0 , the block is in equilibrium ,

.: F₁ - F₂ = 0 ⇒ F₁ - F₂

So option - (1) is right.

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A heavy block kept on a frictionless surface is in equilibrium and being pulled by two ropes of equal mass m. At t = 0, the force on the left rope is withdrawn but the force on the right end continues to act. Let F1 and F2 be the magnitudes of the forces by the right rope and the left rope on the block respectively.