Join TSR now and get all your revision questions answeredSign up now

i dont get the wording of this question Watch

    • Thread Starter
    Offline

    2
    ReputationRep:
    hgujmn
    Attached Images
     
    • TSR Support Team
    • Very Important Poster
    • Reporter Team
    • Welcome Squad
    Offline

    3
    ReputationRep:
    (Original post by KloppOClock)
    hgujmn
    2(iii)?

    What don't you get?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Kvothe the Arcane)
    2(iii)?

    What don't you get?
    "Calculate the distance from AD of the centre of mass of the frame"

    what does that mean, its just words, doesnt make any sense
    • TSR Support Team
    • Very Important Poster
    • Reporter Team
    • Welcome Squad
    Offline

    3
    ReputationRep:
    (Original post by KloppOClock)
    "Calculate the distance from AD of the centre of mass of the frame"

    what does that mean, its just words, doesnt make any sense
    The vertical (perpendicular) distance. The distance from a point (centre of mass) to a line is always the shortest distance.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Kvothe the Arcane)
    The vertical (perpendicular) distance. The distance from a point (centre of mass) to a line is always the shortest distance.
    yes i know that but i dont get what the question is asking, is it asking for the shortest distance between the centre of mass and any point along ad?
    Offline

    0
    ReputationRep:
    (Original post by Kvothe the Arcane)
    The vertical (perpendicular) distance. The distance from a point (centre of mass) to a line is always the shortest distance.
    (Original post by KloppOClock)
    yes i know that but i dont get what the question is asking, is it asking for the shortest distance between the centre of mass and any point along ad?


    Yes fam, it is asking for the shortest distance.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by meaty123)


    Yes fam, it is asking for the shortest distance.
    question still doesnt make sense
    get off ur high horse
    Offline

    3
    ReputationRep:
    (Original post by KloppOClock)
    question still doesnt make sense
    get off ur high horse
    From the centre of mass, drop a line down to AD that is perpendicular to AD. What is the length of this line?
    • Community Assistant
    • Welcome Squad
    Offline

    3
    ReputationRep:
    (Original post by KloppOClock)
    question still doesnt make sense
    get off ur high horse
    Yes it does. If you've learnt centre of mass you should be familiar with the way they word these types of questions. If you imagine AD as the x-axis, and AB as the y-axis (origin at A), you're simply finding the y-coordinate of the centre of mass, which is a perpendicular distance to AD.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by RDKGames)
    Yes it does. If you've learnt centre of mass you should be familiar with the way they word these types of questions. If you imagine AD as the x-axis, and AB as the y-axis (origin at A), you're simply finding the y-coordinate of the centre of mass, which is a perpendicular distance to AD.
    im not familiar at all with the wording of these questions, also, the mark scheme starts chattin **** about vertical moments???
    • Community Assistant
    • Welcome Squad
    Offline

    3
    ReputationRep:
    (Original post by KloppOClock)
    im not familiar at all with the wording of these questions, also, the mark scheme starts chattin **** about vertical moments???
    Yeah. That's how you work out the centre of mass. You work out the horizontal and vertical moments individually for their own 'co-ordinates' so to speak if we are still going by the x-y plane idea.
    Offline

    3
    ReputationRep:
    they want the vertical distance of the COM from line AD
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by RDKGames)
    Yeah. That's how you work out the centre of mass. You work out the horizontal and vertical moments individually for their own 'co-ordinates' so to speak if we are still going by the x-y plane idea.
    well i knew how to do it, just not what it was called...

    also when i did do it, i didnt get the right answer.
    • TSR Support Team
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by KloppOClock)
    hgujmn
    I assume there's more info somewhere for this question?

    EDIT: Yes there is (page 6)
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by notnek)
    I assume there's more info somewhere for this question?
    no, i mean, am i meant to just assume its a lamina object thing? when i did i didnt get the right answer
    • TSR Support Team
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by KloppOClock)
    no, i mean, am i meant to just assume its a lamina object thing? when i did i didnt get the right answer
    Check the edit to my last post.
    • Community Assistant
    • Welcome Squad
    Offline

    3
    ReputationRep:
    (Original post by KloppOClock)
    well i knew how to do it, just not what it was called...

    also when i did do it, i didnt get the right answer.
    It's just \displaystyle X=\frac{\sum m_ix_i}{\sum m_i}. And the 3 things are the lamina itself, E and F. You need to know their masses if you're going by this. Can be slightly different depending on the question.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by notnek)
    I assume there's more info somewhere for this question?

    EDIT: Yes there is (page 6)
    well that edit makes a whole lot more sense now.

    this pic is all i had to work from, was I just meant to guess the masses?

    thanks for helping and not being a condescending prick

    *cough* the bear *cough*
    Attached Images
     
    • TSR Support Team
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by KloppOClock)
    well that edit makes a whole lot more sense now.

    this pic is all i had to work from, was I just meant to guess the masses?

    thanks for helping and not being a condescending prick

    *cough* the bear *cough*
    The creator of the worksheet must have forgotten to add the information.
    Offline

    2
    ReputationRep:
    This is why I don't do Maths.

    I just spent like 5 minutes thinking "But that's not a cone... How can it topple if its a bloody rectangle?"
 
 
 
Poll
How are you feeling about Results Day?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.