Question

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

Answer 1

Given:

Depth of the well = 5m

Maximum work that Nick is able to do = 100J

Maximum load that the rope can bear = 18N

To find:

Maximum weight of water that Nick can pull.

Solution:

If the rope can bear a maximum load of 18N,

Then weight of water W ≤ 18

If Nick is capable to do 100J of work,

Since work= force*displacement

100= W* 5

W = 100/5 = 20

Therefore Nick can pull up 20N of weight of water but the rope can only support a maximum of 18N.

Therefore the maximum weight of water must be 18N.