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Water is drawn from a well into a 5 kg drum of capacity 55 litres, by two ropes connected to the top of the drum. The linear mass density of each rope is 0.5 kg m-1. The work done in lifting water to the ground from the surface of water in the well 20 m below is c × 104 J. The value of c, up to one decimal place, is [g = 10 ms-2]
(Nearest integer)
    Correct answer is '1'. Can you explain this answer?
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    Water is drawn from a well into a 5 kg drum of capacity 55 litres, by...
    Work done in lifting water and drum = (60 x 10 x 20) J = 12000 J
    Total mass of ropes = 40 x 0.5 kg = 20 kg
    As the mass is uniformly distributed over the length, centre of the mass lies at the centre of the rope and while lifting the rope, CM rises by 10 m.
    Work done in the case of ropes = (20 x 10 x 10) J = 2000 J
    Total work done = 14000 J
    Total work done ≈ 1 × 104 J
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    Water is drawn from a well into a 5 kg drum of capacity 55 litres, by two ropes connected to the top of the drum. The linear mass density of each rope is 0.5 kg m-1. The work done in lifting water to the ground from the surface of water in the well 20 m below is c × 104 J. The value of c, up to one decimal place, is [g = 10 ms-2](Nearest integer)Correct answer is '1'. Can you explain this answer?
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