A man places a chain of mass m and length l on a table slowly .initially the lower end of the chain just touches the table ,the man drops the chain when half of the chain is in vertical position then work done by the man in this process is
Asked by m.nilu
20th August 2018,
7:51 PM
Answered by Expert
Answer:
The man drops the chain when half of its length is in vertical position. hence only half of its length is placed by man.
Let l be the full length of chain and m be its total mass. To place the chain of length l/2 on a table,
the decrease in potential energy (m/2)×g×(l/2) = (1/4)m×g×l joules
The decrease in potential energy given above, is the workdone by man. when he drops the other half there is no workdone by him
Answered by Expert
21st August 2018,
9:46 PM
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