Calculating Radius of Circle from String Length

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To calculate the radius of a circle from a string length of 1.2 meters, it's essential to clarify whether the string is wound around the circle or if it represents the circumference. If the string is the circumference, the radius can be found using the formula r = C/(2π), where C is the circumference. The discussion highlights confusion regarding the term "revolving string" and its relevance to the circle's radius. Clear definitions and context are necessary for accurate calculations. Understanding the relationship between the string length and the circle is crucial for solving the problem.
lha08
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Homework Statement


How can i calculate the radius of a circle given the length of string 1.2 meters that is revolving?

Homework Equations





The Attempt at a Solution

 
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You need to be more clear. What do you mean "length of string 1.2 meters that is revolving"? Do you mean that the string is wound around the circle?
 
lha08 said:

Homework Statement


How can i calculate the radius of a circle given the length of string 1.2 meters that is revolving?

Homework Equations





The Attempt at a Solution

What does the "revolving string" have to do with the circle?
 
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?

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