# A numerical based on thrust

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1. Aug 4, 2015

### Pyrus

1. The problem statement, all variables and given/known data
A large cylindrical vessel contains water to a height of 10 m. It is found that the thrust acting on the curved surface is equal to that at the bottom. If atmospheric pressure can support a water column of 10 m, the radius of the vessel is:-
(a) 10 m (b) 15m (c) 5 m (d) 25 m

2. Relevant equations
P=F/A
Vol = πr*r*h

3. The attempt at a solution

2. Aug 4, 2015

### tommyxu3

This may be a key to help you find their relation. Can you get any idea from this information?

3. Aug 4, 2015

### haruspex

Since you have posted no attempt, I assume you are stuck on interpreting the question.

It certainly is strange. I assume this is an upright cylinder. By "thrust acting on the curved surface" they should mean the force acting on the cylinder walls. Since force is a vector, by symmetry, the net force is zero.
So what do you think they might mean?

4. Aug 4, 2015

### Pyrus

I stuck up in force acting on curved surface of cylinder.

5. Aug 4, 2015

### haruspex

In understanding what they mean or in calculating it?