Results 1 to 3 of 3

Math Help - need some help in Alevel maths

  1. #1
    Junior Member
    Joined
    May 2007
    Posts
    36

    need some help in Alevel maths

    hey everyone i have attached the problems i will try to see what how u guys can solve them and later i will ask questions thanks a lot.
    Attached Thumbnails Attached Thumbnails need some help in Alevel maths-math05-3.jpg   need some help in Alevel maths-math05-4.jpg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by carlasader View Post
    hey everyone i have attached the problems i will try to see what how u guys can solve them and later i will ask questions thanks a lot.
    4a). The two reaction forces are equal (you are told so) and as the plank is
    statric their sum must equal the total load which is (60+90)g Newtons, so
    the reaction of the plank at B is 75g N.

    RonL
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by carlasader View Post
    hey everyone i have attached the problems i will try to see what how u guys can solve them and later i will ask questions thanks a lot.
    4b) You do this by taking moments of the forces about A.

    Let x be the distance of the centre of mass of the plank from A. Then
    the sum of the moments of the three forces acting (the weight of the woman,
    the weight of the plank and the reaction at B - the reaction at A has zero moment about A so we ignore it) is:

    2 \times 60 \times g + x \times 90 \times g - 6 \times R_B=0

    where R_B is the reaction at B found in the first part of this question.

    RonL
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Should I buy maths books to teach myself maths.
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: November 21st 2011, 03:45 PM
  2. Help me with my grade 11 maths [easy maths]
    Posted in the Pre-Calculus Forum
    Replies: 11
    Last Post: December 27th 2009, 03:09 PM
  3. [SOLVED] Help with maths
    Posted in the Algebra Forum
    Replies: 1
    Last Post: November 27th 2007, 04:27 AM
  4. Replies: 0
    Last Post: September 5th 2007, 02:50 AM
  5. Replies: 1
    Last Post: October 3rd 2006, 08:59 AM

Search Tags


/mathhelpforum @mathhelpforum