Nick draws water from a well having depth of 5m. Calculate the maximum weight of water he can pull up if the maximum work he is capable of doing is 100 J and he is using a rope to lift the water which can bear a maximum load of 18N.
Options are ....
I. 50 N
II. 20 N
III. 18 N
IV. 35 N
Think carefully dont guess
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Answer:
50 N ok I hope you understand
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Given:
Nick draws water from a well having depth of 5m. The maximum work he is capable of doing is 100 J and he is using a rope to lift the water which can bear a maximum load of 18N.
To find:
Calculate the maximum weight of water he can pull up.
Solution:
Work done by Nick = Work done by water + Work done by rope
W = Mgh + mgh
where M is the weight of water
m is the weight lifted by rope
h is the height of the well
Substitute the values in the above equation.
100 = M × 9.8 × 5 + 18 × 9.8 × 5
100 = 49 M + 882
49 M = 100 - 882
M = - 782/49
M = - 15.95 N (in opposite direction to that of the earth's gravitational force)
M ≈ 16 N
Therefore, the maximum weight of water Nick can pull up is 16 N.
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