Physics Help Forum Basic problem, quick help needed

 Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

 Jul 21st 2016, 01:50 PM #1 Junior Member   Join Date: Jul 2016 Posts: 2 Basic problem, quick help needed Hi, really simple but my head is fried and i can't get my head around this. Would the guage reading at A be as simple as atmospheric pressure+pgh for (ii)?
 Jul 21st 2016, 03:17 PM #2 Senior Member   Join Date: Aug 2010 Posts: 389 The gauge on the right has the column exposed to the air 150 mm below the other column. Therefore, the air pressure in B is 150 mm of mercury below atmospheric pressure. But the gauge on the left shows the entire length of the right arm as 400. What we need to know is how high above the left arm it is.
Jul 21st 2016, 07:45 PM   #3
Junior Member

Join Date: Jul 2016
Posts: 2
 Originally Posted by HallsofIvy The gauge on the right has the column exposed to the air 150 mm below the other column. Therefore, the air pressure in B is 150 mm of mercury below atmospheric pressure. But the gauge on the left shows the entire length of the right arm as 400. What we need to know is how high above the left arm it is.
Has there not been enough information given then?

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