00:01
Hello in the question it is given in a building the water pressure at the ground floor is so let us consider this as a ground floor and this as a second floor and so on we only need first and ground and first floor for this question so this is a ground floor and this is a first floor and the water pressure at the ground floor let us consider it as p1 that is equal to 40 ,000 pascal and pressure at first floor let us consider it as p2 that is equal to 10 ,000 pascal and we need to calculate the height of first floor that is h value we need to find out so if we consider the change in pressure between first floor and second floor that is change in pressure is equal to pressure in ground floor minus pressure in second floor that is equal to 40 ,000 minus 10 ,000, that is equal to 30 ,000, and the unit is pascal.
01:14
So this is the change in pressure between two floors.
01:19
And also we know that equation to calculate gauge pressure or change in pressure that is equal to delta p is equal to row gh.
01:27
Here row is the density of water because we here considering the pressure of water level so density of water is thousand kg per meter cube and g is acceleration due to gravity we must consider it as here 10 meter per second square which is approximately equal to 10 actually its value is 9 .8 meter per second square for convenience here i'm considering it as 10 meter per second square and h we need to calculate, delta p just been calculated.
02:05
Now substituting all the values.
02:07
Before that, it is better to rearrange this equation, that is, h is equal to delta p divided by row into g...