Summation Notation - Variable in the exponent

Click For Summary
To solve a summation of the form Sum(c^i), where c is a constant, it is identified as a geometric series. The condition for convergence is that the absolute value of c must be less than 1 (|c|<1). Under this condition, the sum can be calculated using the formula S = a / (1 - r), where a is the first term and r is the common ratio. This approach allows for the effective evaluation of the series. Understanding these principles is essential for working with variable exponents in summation notation.
Goldenwind
Messages
145
Reaction score
0
[SOLVED] Summation Notation - Variable in the exponent

Homework Statement


img6.gif

This is an example formula.

How do I solve a summation if something is in the form of Sum(c^i), where c is some constant?
 
Physics news on Phys.org
Then it's geometric series. You'll want |c|<1.
 
Thank-you :)
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

Similar threads

  • · Replies 7 ·
Replies
7
Views
1K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 3 ·
Replies
3
Views
1K
Replies
9
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 16 ·
Replies
16
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 4 ·
Replies
4
Views
1K