Hey there! Sign in to join this conversationNew here? Join for free
Turn on thread page Beta
    • Thread Starter
    Offline

    3
    ReputationRep:
    I am trying to find "a" in a question and I have gotten as far as:

    T1 = [mg - (√3 x ma)]/2
    T2 = (2mg x T1)/√3

    I was told by a teacher to sub in 0 for T1 and T2 to get 2 answers for "a", but because I don't know "m" I don't know how that helps?

    Any help of where to go next would be appreiciated, thanks! Let me know if you need any more information about the question to help.
    Offline

    17
    ReputationRep:
    Whats the question? Can u post a picture?
    Posted on the TSR App. Download from Apple or Google Play
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Shaanv)
    Whats the question? Can u post a picture?
    There you go, that's the questions (I am on part b) and the work I have done so far. Thank you! <3
    Attached Images
      
    Offline

    17
    ReputationRep:
    (Original post by ookatiebourneoo)
    There you go, that's the questions (I am on part b) and the work I have done so far. Thank you! <3
    I cant see the picture properly on my mobile, but i assume that u have expressions for the tension in each string.

    For a string to go slack there has to be no tension in the string, so u can find the acceleration needed to make each string go slack. By solving when T=0
    Posted on the TSR App. Download from Apple or Google Play
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Shaanv)
    I cant see the picture properly on my mobile, but i assume that u have expressions for the tension in each string.

    For a string to go slack there has to be no tension in the string, so u can find the acceleration needed to make each string go slack. By solving when T=0

    Yes that's it! But how do I solve for T=0 with the equations that I provided in the original question as I don't know the mass?
    Offline

    17
    ReputationRep:
    (Original post by ookatiebourneoo)
    Yes that's it! But how do I solve for T=0 with the equations that I provided in the original question as I don't know the mass?
    The masses should cancel out if I’m not mistaken.

    In BC, T=0.5mg-0.5am(root 3)

    When T=0, 0.5mg=0.5ma(root 3).

    Can u see how mass cancels out?
    Posted on the TSR App. Download from Apple or Google Play
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Shaanv)
    The masses should cancel out if I’m not mistaken.

    In BC, T=0.5mg-0.5am(root 3)

    When T=0, 0.5mg=0.5ma(root 3).

    Can u see how mass cancels out?

    Yes I can see that, thanks! How do I do that for the T2 equation? Do I sub in the equation for T1? I am stugglign subbing it in then cutting down the eqation to get "a=".
    Offline

    17
    ReputationRep:
    (Original post by ookatiebourneoo)
    Yes I can see that, thanks! How do I do that for the T2 equation? Do I sub in the equation for T1? I am stugglign subbing it in then cutting down the eqation to get "a=".
    U have resolved horizontally to get an equation relating t1 and t2 so u can substitute in ur t1 equation, then make t2 equal to zero and rearrange. U should be able to reduce it down to find the acceleration.
    Posted on the TSR App. Download from Apple or Google Play
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: October 28, 2017
Poll
“Yanny” or “Laurel”
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

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