# Calculate the length of the thread -

1. Oct 28, 2012

### engboysclub

1. The problem statement, all variables and given/known data

The world’s largest ball of string is about 2 meter in radius. To the nearest order of magnitude, i.e.,
the power of ten, determine what is the total length of the 4mm diameter string in the ball?

2. Relevant equations

3. The attempt at a solution

I calculated the volume of the ball "(considering it to be a sphere), using 2m as radius - After getting the value, I assumed the thread to be a "cylinder" and used "Cylinder's volume formula" --- V=Pie x R(squared) x H and calculated H ..

Is that correct ?

2. Oct 28, 2012

### Staff: Mentor

Sounds like a reasonable enough approach that should get you within a factor of ten.

3. Oct 28, 2012

### engboysclub

Factor of ten ? What does it exactly means ?

We call it "Tenths, Hundredths, etc " - I have an idea, but please elaborate so I may not have confusion ever.

4. Oct 28, 2012

### Staff: Mentor

From the original problem statement: "To the nearest order of magnitude, i.e.,
the power of ten", meaning that they are not asking for an exact answer, but rather one that gives you an idea about the magnitudes we're dealing with. Generally when a problem is stated that way, an answer that is off by a factor of two or three in either direction is acceptable.

5. Oct 28, 2012

### engboysclub

Perfect ! Thanks a lot !