The pressure of water on the ground floor is 40,000 Pa and on the first floor is 10,000 Pa. Find the height of the first floor. (Take : density of water = 1000 kg m-3, g = 10 m s-2)

(a) density of water = 1000 kg m ^-3

g = 10 m s^-2

P_w on ground floor = 40,000 Pa

P_w on first floor = 10,000 Pa

In order to know the height of the first floor, let us calculate the difference in pressure

P = 40,000 – 10,000 = 30,000 Pa

Now, P = h ρ g

30000 = 1000 × 10 × h

h = 30000/10000 = 3 m

Hence, the height of the first floor = 3 m.