A water barometer is used to measure air pressure in a duct where the air is being forced to ventilate a building. One end of the barometer is open to the atmosphere, and the other end is open to the inside of the ductwork.  When the tube is bent in the shape of a U, the technician notes that the water level on the side toward the duct is lower than the side toward the atmosphere by 13.4 cm.  What is the pressure difference in N/m2?  The density of water is 1 gm/cm3  or 1000 kg/m3.   Use 9.8 m/s2 for the acceleration of gravity.

A new gel is being developed to use inside padding and helmets to cushion the body from impacts. The gel is stored in a 4.9 cubic meters [m] cylindrical tank with a diameter of 2 meters [m]. The tank is pressurized to 1.3 atmosphere [atm] of surface pressure to prevent evaporation. A total pressure probe located at the bottom of the tank reads 57 feet of water [ft H, 0]. What is specific gravity of the gel contained in the tank?

The two arms of a U-tube are not identical, one having 2.5 times the diameter of the other. A cork in the narrow arm requires a force of 16 N to remove it. The tube is filled with water and the wide arm is fitted with a piston. The minimum force that must be applied to the piston to push the cork out is:

The figure below shows a horizontal pipe with a varying cross section. A liquid with a density of 1.65 g/cm3 flows from left to right in the pipe, from larger to smaller cross section. The left side's cross-sectional area is 10.0 cm2, and while in this side, the speed of the liquid is 2.46 m/s, and the pressure is 1.20 x 10° Pa. The right side's cross sectional-area is 3.00 cm?. (a) What is the speed (in m/s) of the liquid in the right side (the smaller section)? (Enter your answer to at least three significant figures.) m/s (b) What is the pressure (in Pa) of the liquid in the right side (the smaller section)? Pa

The Earth's atmosphere at sea level and under normal conditions has a pressure of 1.01x105 Pa, which is due to the weight of the air above the ground pushing down on it. How much force due to this pressure is exerted on the roof of a building whose dimensions are 10.2 m long and 14.5 m wide?

The water of a 14’ × 48’ metal frame pool can drain from the pool through an opening at the side of the pool. The opening is about h = 1.11 m below the water level. The capacity of the pool is V = 3880 gallons, the pool can be drained in t = 10.2 mins. P0 is the pressure of the atmosphere. ρ is the density of the water. a) Write the Bernoulli’s equation of the water at the top of the pool in terms of P0, ρ, h. Assuming the opening is the origin.  b) Write the Bernoulli’s equation of the water at the opening of the pool in terms of P0, ρ, h and v, where v is the speed at which the water leaves the opening. Assuming the opening is the origin.  c) Express the flow rate of the water in terms of V and t.  d) Calculate the numerical value of A in cm2

A tall graduated cylinder contains 7 cm of oil (density of 825 kg/m3kg/m3) on top of 20 cm of water (density of 1000 kg/m3kg/m3). The cylinder is open to the air. What is the pressure in the water, 3 cm above the bottom of the cylinder? (in Pa)  1.0323×105  1.0335×105  1.0353×105  1.0294×105  1.0157×105

Water enters a 4 cm diameter pipe at a pressure of 210 kPa and a velocity of 4 m/s. The pipe diameter narrows to 3 cm as its height is elevated by 2 m. If the pressure at the higher end is 150 kPa, then what is the velocity (V) of the water at the higher end of the pipe (h2)?

As the depth in a fluid increases, the pressure increases due to the larger weight of the column of fluid above. At what depth, in meters, a column of mercury is the pressure 1.00 atm? The density of mercury is 13.6 × 103 kg/m3.  h=

A nozzle with a radius of 2.5 mm is attached to a garden hose with a radius of 9 mm. The flow rate through hose and nozzle is 500 cm3/s. The speed of water in the hose is