#1**+5 **

Hi 315,

This is very difficult to see/ read

I can't answer anyway but I think Alan will have a problem as well. :)

Melody
Nov 9, 2014

#2**+13 **

Hi Ms. Melody,

My eyes are young and work well for reading fine print and old text books.:)

315's answers are correct. (IMHO)

The second answer can be reduced.

I was reading a similar question in an ancient text book that uses look up tables and slide rules.

The formula is just a variation on the circumference of a circle.

T= (2pi *L*sin(theta) )/Sqr(L*g*sin(theta)*tan(theta))

Rearranges to

T= 2pi *sqrt(L^{2}*sin^{2}(theta))/(g*L *sin(theta)*tan(theta))

Reduces to

**T= 2pi *sqrt(L*cos(theta)/g)**

Though mathematically the same, these ancient text books often simplified the equations as much as possible to make the use of a slide rule easer.

As far as I know, I’m the only student in my school who uses a slide rule. They never need batteries and it makes a great back scratcher. Hahaha

_7UP_

SevenUP
Nov 9, 2014

#3**+5 **

Where do you buy a slide rule SevenUp. Do you have good antiques stores around your place? LOL

Melody
Nov 9, 2014

#4**+13 **

Actually, I have three. One is a gift from my grandfather. It’s made from bamboo, and he used it when he was in college and my father did too.

Another is a gift from my cousin who goes to an Amish school in Pennsylvania, where electricity –even from a battery --is not used, so no calculators. He carved this himself, and it is more a work of art than practical.

The third one, my older brother found on eBay. It’s plastic and precise. That is the one I carry to school. It's a little longer than the others so it makes a better back scratcher. :)

_7UP_

SevenUP
Nov 10, 2014