Answer:
a) 
      
b)
   
Explanation:
Given that:
diameter d = 12 in
thickness t = 0.25 in
the radius = d/2 = 12 / 2 = 6 in
r/t = 6/0.25 = 24 
24 > 10
Using the  thin wall cylinder formula;
The valve A is opened and the flowing water has a pressure P of 200 psi.
So;




b)The valve A is closed and the water pressure P is 250 psi.
where P = 250 psi






The free flow body diagram showing the state of stress on a volume element located on the wall at point B is attached in the diagram below
 
        
             
        
        
        
Please add more details because I don’t know if you are using a book or passage, therefore I cannot help you unless you add more detail
        
             
        
        
        
Answer:
The right solution is "2625 kN".
Explanation:
According to the question,
The average pressure will be:
= 
By putting values, we get
= 
= 
= 
hence,
The average force will be:
= 
= 
= 
Or,
= 
 
        
             
        
        
        
Answer:
1
Explanation:
because every time you dived a number by its own number it is 1