49 CHAPTER 1 1-101 Consider a U-tube whose arms are open to the atmo- sphere. No

Question

49 CHAPTER 1 1-101 Consider a U-tube whose arms are open to the atmo- sphere. Now equal volumes of water and light oil ( = 790 kg/m2) are poured from different arms. A person blows from the oil side of the U-tube until the contact surface of the two fluids moves to the bottom of the U-tube, and thus the liquid levels in the two arms are the same. If the fluid height in each arm is 75 cm, determine the gage pressure the person exerts on the oil by blowing. -Air Oil Water-T175 cm FIGURE P1-101 1-102 The basic barometer can be used as an altitude- ing device in airplanes. The ground control reports

Explanation / Answer

from Bernoulli' equation,

P_atm + (rho_water g h ) - (rho_oil g h ) - P_air = 0

P_air - P_atm = g h (rho_water - rho_oil)

P_gauge = P_air - P_atm = (9.8 x 0.75)(1000 - 790)

= 1543.5 Pa ......Ans

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