Pressure and pressure differences in fluids (physics only): แบบฝึกหัด

A rectangular wooden block has a weight of \(12\text{ N}\) and a base area of \(0.04\text{ m}^2\). Calculate the pressure it exerts on a horizontal surface.

Which statement correctly explains why pressure in a liquid increases with depth?

A cylindrical container with a base radius of \(0.1\text{ m}\) is filled with oil (density \(= 900\text{ kg/m}^3\)) to a height of \(0.5\text{ m}\). Calculate the force exerted by the oil on the base of the container. (Take \(g = 9.8\text{ N/kg}\) and \(\pi = 3.14\))

Atmospheric pressure is created by air molecules colliding with a surface. Why does atmospheric pressure decrease as altitude increases?

A diver is swimming in a lake where the density of water is \(1000\text{ kg/m}^3\). If the diver descends by an additional \(5\text{ m}\), calculate the increase in pressure they experience. (Take \(g = 9.8\text{ N/kg}\))

A rectangular block with a base area of \( 0.05\text{ m}^2 \) is submerged in a liquid of density \( 1000\text{ kg/m}^3 \). The top surface is at a depth of \( 0.2\text{ m} \) and the bottom surface is at a depth of \( 0.5\text{ m} \). Calculate the upthrust acting on the block.
(Take \( g = 9.8\text{ N/kg} \))