Water flows steadily through a horizontal pipe of varying cross section. at one place the pressure 15 1.5 atm and the speed is 1.0 m/sec. determine the pressure at another place where the speed is 10 m/sec.
a. 0.5 atm
b. 0.6 atm
c. 0.7 atm
d. 0.8 atm
e, 1.0 atm

D. 1 atm

Explanation:

pressure P1 = 1.5 atm = 1.5 x 101325 = 151987.5 N/m^{2}

speed V = 1 m/s

speed U = 10 m/s

pressure P2 = ?

applying Bernoulli's equation we can find the pressure P2

where ρ is the density of water = 1000 kg/m^{3}

P2 = 102487.7 N/m^{2}

P2 = 102487.7 / 101325 = 1.01 atm = 1 atm

real, smaller and upside-down.   so the answer should be b.

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