. The mass of bucket full of water is 15 kg
It is being pulled up from a 15 m deep well. Due to a hole in the bucket 6 kg water flows out of the bucket at a uniform rate.
The work done in drawing the bucket out of the well will be (g=9.8ms-2).
A: 900 J
B: 1500 J
C: 1800 J
D: 2100 J
The Potential energy stored in the water column is mgh [Where m is the mass of the water, g is the gravitational acceleration, h is the height of the water column]
The weight of the water and the bucket
Now the potential energy is =(90×15)N
The total potential energy =(450+1350)=1800 Joule
At first the potential energy remain zero.
The change in potential energy =work done=(1800-0) Joule
So, the work done in drawing the bucket is 1800 Joule.
The work done in drawing the bucket out of the well will be 1800 Joule.
Hence option(C) is correct.