Physics, asked by chandni10301, 1 year ago

A chain of length l and mass m is slowly pulled at constant speed up over the edge of a table by a force parallel to the surface of the table. Assuming that there is no friction between the table and chain calculate the work done by force till the chain reaches to the horizontal surface of the table

Answers

Answered by aristocles
46

work done to move the chain up on the table is given as change in the potential energy of the chain

Here initially whole chain of length L is suspended at the edge of the table

now the chain will bring up on the table so its potential energy is taken for whole mass on the table at final position

Now we can say that

final potential energy - initial potential energy = work done

U_f = 0

U_i = -mg\frac{L}{2}

Now work done is

W = 0 - (-mg\frac{L}{2})

W = mg\frac{L}{2}

So above is the work done to pull the chain

Answered by sheetalshreya11n48
22

here we will apply the concept of centre of mass and conservation of energy

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