Wednesday
June 19, 2013

Homework Help: Physics

Posted by Anonymous on Monday, March 26, 2012 at 3:51pm.

how to find how many ridges a 10 p coin has?
What do we measure and how do we work it out?

• Physics - Steve, Monday, March 26, 2012 at 4:10pm

this is physics?

measure the circumference C of the coin
measure the distance D between two ridges

number of ridges = C/D

For example, if the coin is 5 cm around, and each ridge occupies 1 mm (.1 cm), then there are 5/.1 = 50 ridges.

• Physics - Zahid, Wednesday, April 4, 2012 at 9:15pm

You need to add one as there is one extra ridge compared to the number of spacings between ridges

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