A cottage near a sloping field receives water from a water container located 7.0 m deep at the top of the slope. Determine the water gauge pressure at the cottage if the water flows through a pipe that is 86 m long and inclined at an angle of 56° from the horizontal.

A water tank on the ground level supplies water to a building. The topmost floor of the building is 55 m above the ground. What should be the minimum gauge pressure in the tank so that water reaches this topmost floor?

An oil barometer is used to measure atmospheric pressure. The atmospheric pressure is 1.013×10⁵ Pa. Calculate the height of the oil column in the barometer if the pressure at the bottom of the column is equal to the atmospheric pressure. Use: density of oil 𝜌=850 kg/m³ and g=9.8m/s².