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As physics moments question

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Please could you help me answer this question? :smile:
uploadfromtaptalk1363790169402.jpg142.6KB
have you sketched the diagram? Once you have done this, take moments about the centre. What particular troubles are you having? How far have you got?
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Okey so I drew the diagram but I made the assumption that the ruler would pivot at around 50cm therefore having two weights on one side and one on the other.
If I then work try to work out W using the principle of moments I don't get the correct answer.
Reply 3
Avatar for Albino
Albino
11
Original post by tamsinisinabarn
Posted from TSR Mobile

Okey so I drew the diagram but I made the assumption that the ruler would pivot at around 50cm therefore having two weights on one side and one on the other.
If I then work try to work out W using the principle of moments I don't get the correct answer.


What answer do you seem to be getting?
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I get an answer of 2.3...
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I realised that I was taking the distances as the values from the question instead of taking them as the distance from the pivot. Even making this change I get an answer of 6.16
uploadfromtaptalk1363814713554.jpg

Here is how I have answered the question and got my answer if it helps to work out what i've done wrong :smile:
Oh i'm sorry, I have been reading the answers wrong! My workings are correct and so is the answer! Feel a little silly but thankyou for your help. I'll leave this here, it may be useful to someone.

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Reply 8
Avatar for fayled
fayled
9
Original post by tamsinisinabarn
uploadfromtaptalk1363814713554.jpg

Here is how I have answered the question and got my answer if it helps to work out what i've done wrong :smile:


Can't see anything wrong with that - what is the answer in the book?

Edit: Seen above post - you were just having one of those moments.

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