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

Solids Elasticity (Bulk Modulus)

  • Thread starter asoz
  • Start date
  • #1
3
0

Homework Statement


When the water freezes it expands by about 9.00%. What pressure increase would occur inside your automobile engine block if the water in it froze?(The bulk modulus of ice is 2.00 x 10^9 N/m^2).


Homework Equations


[tex]B=\frac{\Delta P}{\Delta V / V_i}[/tex]

The Attempt at a Solution


If I solve the problem "forward in time" I get this:
[tex]\Delta P=\frac{1.09V_i-Vi}{Vi}B=0.09B[/tex]

but if solving the problem "backwards in time"

[tex] \Delta P = \frac{V_i-1.09V_i}{1.09V_i}B = 0.0826B [/tex]

Shouldn't both answers have the same magnitude?
 
Last edited:

Answers and Replies

  • #2
Mapes
Science Advisor
Homework Helper
Gold Member
2,593
17
No; 90% of 110% of x is not x, for example.
 
  • #3
3
0
Of Course. Thanks
 

Related Threads for: Solids Elasticity (Bulk Modulus)

  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
1
Views
6K
  • Last Post
Replies
1
Views
7K
  • Last Post
Replies
3
Views
7K
  • Last Post
Replies
3
Views
6K
  • Last Post
Replies
1
Views
7K
  • Last Post
Replies
3
Views
20K
Top