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    Hi

    http://www.mei.org.uk/files/papers/J..._2013_June.pdf
    Question 3 part 3 - MEI M2 June 13

    I can do this question by taking moments about A but I dont get the same answer by taking moments about B.

    i.e. M(B): Clockwise = anticlockwise
    Ra x 0.8 = 60cos40 x 0.5 + 60sin40 x0.1
    Ra = 33.55
    vertically Ra x sin40 = 29.1N

    But taking moments about A gives vertical support as 50.5N

    Thanks in advance
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    (Original post by 123_qwerty)
    Hi

    http://www.mei.org.uk/files/papers/J..._2013_June.pdf
    Question 3 part 3 - MEI M2 June 13

    I can do this question by taking moments about A but I dont get the same answer by taking moments about B.

    i.e. M(B): Clockwise = anticlockwise
    Ra x 0.8 = 60cos40 x 0.5 + 60sin40 x0.1
    Ra = 33.55
    vertically Ra x sin40 = 29.1N

    But taking moments about A gives vertical support as 50.5N

    Thanks in advance
    Link is broken but I'll give you a hint.

    For angle moments, remember that the moment is the force multiplied by the perpendicular distance to the line of action of the force. Don't use the vertical/horizontal components of the force.
 
 
 
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