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Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.Calculation of workMedium2 minQB

PhysicsMediumsingle choice

A uniform chain of length 3 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 6 kg. What is the work done in pulling the entire chain slowly on the table?

Options:

Answer:

Solution:

The mass per unit length is

$λ = \frac{6}{3} = 2 kg/m$

Initially, 0.6 m of chain hangs below the tabletop.

$m_{h} = λ (0.6) = 1.2 kg$

Its centre of mass rises by 0.3 m.

$W = m_{h} g Δ h$

$W = (1.2) (10) (0.3) = 3.6 J$

Option A.

Stream:JEESubject:PhysicsTopic:W.E.P.Subtopic:Calculation of work

⏱ 2mℹ️ Source: QB

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