A U-shaped tube is closed at one end p, the other end is open to the atmosphere. There 12. is a layer of oil h, = 97 cm and a layer of ethyl alcohol h = 68 cm above the water. The three liquids do not mix. The oil is a depth d = 18.5 cm below the closed end. What is the gauge pressure at the closed end, p.? レPo ho P3 Pw

8. A U-shaped tube is closed at one end p,, the other end is open to the atmosphere. There Pl PA is a layer of oil h = 99 cm and ethyl alcohol h, = 33 cm above the water. The three liquids do not mix. The oil is a depth d = 33.5 cm below the closed end. What is the gauge pressure at the closed end, p,? %3D h ルP。 hol P3 A d Pw

A viewing window on the side of a large tank at a public aquarium measures 37 in. by 42 in. The average gauge pressure from the water is 7 psi. What is the total outward force on the window?  lb

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