The U-tube shown in Figure 12 contains mercury with a density of 13,600 kg/m3. It is open on one end and the other end is connected to a boiler, which contains water at high pressure. The water from the boiler pushes directly on the mercury column. What is the gauge pressure at point A in the boiler?

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Question

The U-tube shown in Figure 12 contains mercury with a density of 13,600 kg/m3. It is open on one end and the other end is connected to a boiler, which contains water at high pressure. The water from the boiler pushes directly on the mercury column. What is the gauge pressure at point A in the boiler?

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summersnow8 · Answer

what?

summersnow8 · Answer

What is the gauge pressure at point A in the boiler?

summersnow8 · Answer

oh okay

summersnow8 · Answer

wouldn't you do:

p+ρ0gh0=ρgh
p=ρgh-ρ0gh0
ρ0=10^3 kg/m^2
h0=0.013 m
h=0.034 m

shamim · Answer

3.4-1.3=height of water
=2.1m
pressure of this water is 
p=hdg
p=2.1*13600*9.8

summersnow8 · Answer

i think the answer might be 4.4 kPa

shamim · Answer

may b

shamim · Answer

i hv no paper n pen near my hand

summersnow8 · Answer

but i dont know how to find that.

shamim · Answer

use calculator

summersnow8 · Answer

well tried looking it up and it says p=10^3*9.8*0.034+13.6x10^3*9.8*0.013
p=4.4x10^3 Pa , but i am not getting that

shamim · Answer

still trying

summersnow8 · Answer

because gauge pressure= pressure- atmosphere pressure

summersnow8 · Answer

i solved it

shamim · Answer

good