A person blows fromthe oil side of the U-tube until the contact surface of the two fluids moves to the bottomof the U-tube, and thus the liquid levels inthe two ams are the same. If the fluid height in each arm is 30 in, determine the gage pressure the person exerts on the oil by blowing.

The diameter of one arm of a U-tube is 12 mm while the other arm is large. If the U-tube contains some water and both surfaces are exposed to atmospheric pressure, determine the difference between the water levels in the two arms. The surface tension and density of water at 20°C are σs = 0.073 N/m and ρ = 1000 kg/m3.   What is the difference between the water levels in the two arms (in  mm.)

Water fills the pipe AB such that the absolute pressure at A is 450 kPa . The inner diameter of the pipe is 55 mm . The density of the water is 1000 kg/m³. Acceleration due to gravity is 9.81 m/s². (Figure 1) Figure B 0.3 m 0.4 m If the atmospheric pressure is 101 kPa, determine the resultant force the water and surrounding air exert on the cap at B. Express your answer to three significant figures and include the appropriate units.