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

Dimensional analysis of simple pendulm

  • #1
101
0

Homework Statement



Use dimensional analysis to determine the dependence of the period T of
a simple pendulum on its mass m , weight w , length l and arc-length of
swing s.

Homework Equations


g= [L/T2]

The Attempt at a Solution



T =cst * malbgcsd

[T]=malbgcsd
=[M]a[L]b[g]c[L]d
okay im making a mistake here aren't I? by including the arc-Length? i do not know why i should not include it? some one explain? im a bit confused... after this I'll be able to go on.

then i will equate the exponents and solve it.

EDIT: Thanks in advance
 

Answers and Replies

  • #2
101
0
a=0
b+c+d=0
-2c=1 => c=-1/2

b+d=1/2 ==> b=d=1/4

T=l1/4g-1/2s1/4

but T= 2π (l/g)1/2

what i did is is correct?
 
  • #3
101
0
could someone help me out here?
 

Related Threads on Dimensional analysis of simple pendulm

  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
5
Views
599
Replies
2
Views
328
  • Last Post
Replies
6
Views
5K
Replies
5
Views
2K
Replies
4
Views
9K
Replies
3
Views
855
  • Last Post
Replies
5
Views
3K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
0
Views
1K
Top