Original post by Super199
What is the general formula for the CoM of a semi circle?
Original post by Marxist
What is the general formula for the CoM of a semi circle?
I thought it was 2rsinalpha/3alpha. Where alpha = pi/2?
Original post by Super199
I thought it was 2rsinalpha/3alpha. Where alpha = pi/2?
That is the formula for a sector of a circle - the general formula for the CoM of a semi-circle is 4r/3pi
Original post by Marxist
That is the formula for a sector of a circle - the general formula for the CoM of a semi-circle is 4r/3pi
That's what he's said. "where "
Original post by Zacken
That's what he's said. "where "
Oops yes. I was up late to help this guy for some odd reason - I barely read the reply properly. Sorry OP.
Original post by Zacken
That's what he's said. "where "
I don't see the point of using 2rsinaplha/3alpha though for this question when you can see that it's a semi-circle and therefore 4r/3pi.
Original post by Super199
I thought it was 2rsinalpha/3alpha. Where alpha = pi/2?
What is the distance from the CoM of the semi-circle to CD? That's where you're going wrong.
(edited 7 years ago)
Original post by Marxist
What is the distance from the CoM of the semi-circle to CD? That's where you're going wrong.
I thought it would be 3+ com of semi
Original post by Super199
I thought it would be 3+ com of semi
Are you sure? That's not correct. What's the distance of the CoM from AB?
Original post by Marxist
Are you sure? That's not correct. What's the distance of the CoM from AB?
dw I've done it now. 6-com of semi circle is what you could have said at the start
Original post by Super199
dw I've done it now. 6-com of semi circle is what you could have said at the start
Good and nah, it's better to get the answer out of someone than to tell them the answer.
Quick Reply
Related discussions
- the issac physics astronomy question
- TOF maths q
- Partial derivatives and small changes
- Stationary Points 5
- chem help
- FM2, Elastics and springs question
- a level physics- Engineering option question (1)
- Amount of substance q help
- A level chemistry time of flight mass spectrometry questions
- Confused on how to word this centre of mass problem with steel beams
- A Level Further Mechanics Centre of Mass Q
- hard titration alevel chem Q!
- *hard* collisions question
- OCR A Gravitational fields help
- How far from the Earth do you have to be to be at true 0 gravity?
- Moments
- Moments
- Issac Physics Problem that I am stuck with
- Equilibrium
- ladders!!! - M2
Latest
Trending
Last reply 2 days ago
Did Cambridge maths students find maths and further maths a level very easy?Last reply 2 weeks ago
Edexcel A Level Mathematics Paper 2 unofficial mark scheme correct me if wrongMaths
71
Trending
Last reply 2 days ago
Did Cambridge maths students find maths and further maths a level very easy?Last reply 2 weeks ago
Edexcel A Level Mathematics Paper 2 unofficial mark scheme correct me if wrongMaths
71
