# Static Fluid question

1. May 11, 2014

### bennyq

1. The problem statement, all variables and given/known data

One hundred millilitres of water is poured into a U-tube that has a cross-sectional area of 1 cm2. Then 100 millilitres of oil, with a density 80% that of water, is poured down one side of the U-tube so that the oil floats on the water. Find the difference in height of the liquid surfaces on the two sides of the U-tube.

2. Relevant equations
P=gph

3. The attempt at a solution
Just struggling to get started, i know that on either side that at a certain point the pressures are equal.
Just a pointer to get going would be great..

2. May 11, 2014

### Staff: Mentor

Match them up at the bottom of the U.

Chet

3. May 11, 2014

### bennyq

in my sketch, i have Pa = LHS p(oil)gh = RHS p(water)gL .. g cancels our but i have two unknowns..which is the different heights of each column?

4. May 12, 2014

### Staff: Mentor

If h is the height of the oil above the oil-water interface, and L is the height of the water above the oil-water interface, the h = 100 cm.

Chet

5. May 12, 2014

### bennyq

ah okay, thank you chet