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# Mechanics 3: circular motion

Maths and statistics discussion, revision, exam and homework help.

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1. Mechanics 3: circular motion
Help with Q4b,6c and 7 please! I have tried but failed
(I'll uploaded my attempt at question 7)
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Last edited by lekha2611; 03-05-2012 at 21:05.
2. Re: Mechanics 3: circular motion
Just taking a look at your anser for q7, it looks like you have resolved the forces incorrectly

At the top:

3. Re: Mechanics 3: circular motion
For Q7.

Your re-arrangement to get (4) (I think it's 4; difficult to read), is incorrect in the last couple of lines, and should be

Then when you sub (3) into (4), there is no need to square the brackets, as you're substituting for , not .
4. Re: Mechanics 3: circular motion
(Original post by Phredd)
Just taking a look at your anser for q7, it looks like you have resolved the forces incorrectly

At the top:

(Original post by ghostwalker)
For Q7.

Your re-arrangement to get (4) (I think it's 4; difficult to read), is incorrect in the last couple of lines, and should be

Then when you sub (3) into (4), there is no need to square the brackets, as you're substituting for , not .
Thank you for spotting that for me! I'll try that question (7) again then, thank you!
5. Re: Mechanics 3: circular motion
(Original post by Phredd)
Just taking a look at your anser for q7, it looks like you have resolved the forces incorrectly

At the top:

Looking back at this, when you resolve downwards, the weight would be added to the tension surely? Tension would be acting toward the centre of the system as well as the weight, which acts vertically as well?

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Last updated: May 8, 2012
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