Hey there! Sign in to join this conversationNew here? Join for free

Rearranging formula Watch

Announcements
    • Thread Starter
    Offline

    1
    ReputationRep:
    I need some help with rearranging formula.
    the first one is. Make r the subject of the formula:
    H = w^2 / 2g (R^2 - r^2)
    and the second one is. Make a the subject of the formula:
    T = (Sqrt pbh / 4 + a^2)

    Please give some working along with the answer
    Thanks in advance
    • Very Important Poster
    Offline

    21
    ReputationRep:
    (Original post by kszyni1)
    I need some help with rearranging formula.
    the first one is. Make r the subject of the formula:
    H = w^2 / 2g (R^2 - r^2)
    and the second one is. Make a the subject of the formula:
    T = (Sqrt pbh / 4 + a^2)

    Please give some working along with the answer
    Thanks in advance
    Are you still stuck? What have you tried?
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by SeanFM)
    Are you still stuck? What have you tried?
    I've rearranged the second one but I'm stuck on the first one I'm not sure how to get rid of the brackets and all of the powers :/
    • Very Important Poster
    Offline

    21
    ReputationRep:
    (Original post by kszyni1)
    I've rearranged the second one but I'm stuck on the first one I'm not sure how to get rid of the brackets and all of the powers :/
    As you've written it it is ambiguous.

    Is it  H = \frac{w^2}{(2g) \times (R^2 - r^2)}?
    • Thread Starter
    Offline

    1
    ReputationRep:
    yes
    Offline

    3
    ReputationRep:
    Everytime I see this topic, I fully get disgusted
    God just needs to help I do well tbh

    Posted from TSR Mobile
    Online

    15
    ReputationRep:
    (Original post by kszyni1)
    yes
    If you multiply both sides of equation by  R^2-r^2 and divide both sides by  H you get
     \displaystyle  R^2-r^2=\frac{w^2}{2gH} .
    Can you do anything from here?
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by B_9710)
    If you multiply both sides of equation by  R^2-r^2 and divide both sides by  H you get
     \displaystyle  R^2-r^2=\frac{w^2}{2gH} .
    Can you do anything from here?
    I'm fine form there thanks a lot
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Break up or unrequited love?
    Useful resources

    Study tools

    Rosette

    Essay expert

    Learn to write like a pro with our ultimate essay guide.

    Thinking about uni already?

    Thinking about uni already?

    See where you can apply with our uni match tool

    Student chat

    Ask a question

    Chat to other GCSE students and get your study questions answered.

    Creating

    Make study resources

    Create all the resources you need to get the grades.

    Planner

    Create your own Study Plan

    Organise all your homework and exams so you never miss another deadline.

    Resources by subject

    From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

    Papers

    Find past papers

    100s of GCSE past papers for all your subjects at your fingertips.

    Help out other students

    Can you help? Study help unanswered threads

    Groups associated with this forum:

    View associated groups
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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.