• Support PF! Buy your school textbooks, materials and every day products Here!

Pressure in liquids question

  • Thread starter jasonlaiyh
  • Start date
  • #1

Homework Statement


A container consists of two tubes, tube A which is wider and tube B which is narrower. The diameter of a tube A is four times that of tube B. Some mercury is poured into the container first and then water is added into the thin tube until it reaches a depth of 70 cm.

a) By how much does the mercury in the big tube rise?

b) By how much does the mercury in the thin tube fall?

c) If the water is poured into the wide tube, what is the difference in height of the mercury level between the narrow tube and the wide tube?



Homework Equations


P=hρg
(though I think no calculations are needed)


The Attempt at a Solution


I really have no idea on how to do this, but I'm guessing that the heights are the same since the pressure is the same?
Please help! This is my own revision and not a homework because my physics paper for my o-level is coming next week.
 
Last edited:

Answers and Replies

  • #2
1,198
5
Is the situation a U-tube manometer with a diameter change?
 
  • #3
It's as stated a container with diameter change.
What I understand is that the pressure is not affected by shape.
So the heights should be equal, right?
The problem is I don't know how to get the length.
 

Related Threads on Pressure in liquids question

Replies
29
Views
6K
  • Last Post
Replies
20
Views
641
  • Last Post
Replies
4
Views
584
  • Last Post
Replies
4
Views
986
  • Last Post
Replies
1
Views
570
  • Last Post
Replies
3
Views
9K
  • Last Post
Replies
7
Views
3K
Replies
10
Views
1K
  • Last Post
Replies
2
Views
431
  • Last Post
Replies
2
Views
3K
Top