Question

A waterbed is 2 meters on a side and 30 cm deep. A) Find its weight. B) Find the pressure of the bed exerted onto the floor.

4. Calculate the absolute pressure at an ocean depth of 1000 meters. Assume the density of water is 1000 kg/m3 , and take Pa = 1.013 X 105 Pa.

Answer 1

A) Weight:

$$W=mg=\rho Ahg=11760\text{ N}.$$

B) Pressure:

$$p=\rho gh=2940\text{ Pa}.$$

4. The absolute pressure:

$$p=\rho_wgh_w+p_0=9.9\text{ MPa}.$$