http://www.beanos.co.uk/bnews/014/index.php

...asks how long an average groove on an LP record is. It gives the answer 'longer than five football pitches'.

]]>Ther is usually just one long spiral groove on a side. The length of the groove will vary, because playing time, groove position, etc will vary. So we can only estimate it.

To estimate the length of groove, imagine thay are lots of circles. How many circles? Well, if it does 33 1/3 revolutions per minute and there are 30 minutes, that makes 1000.

If the average radius is 8 cm (I am not sure of that, just seems reasonable on a 30cm wide LP), then the average circumference would be 2 x π x 8 = 50 cm

So 1,000 x 50 = 50,000 cm, or 500m

(Possibly ...)

]]>thanks for ur help]]>

It also depends if you are using a balance beam, or normal scales that give you direct measurement.

In a nutshell, you could weigh 6 vs 6, then the lighter group has the light coin, then 3 vs 3, then 1 vs 1 (if they are the same then the one not measured would be it)

]]>if there a 12 coins ,identical in apereence but one is lighter wat is the quickest way to find it

how long is a grove in a long playiong record

plz help me pronto need anwsers fro tomorrow cant think need help

thanks

maths stuck

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