The Student Room Group

Where have I gone wrong? moment M1



So I labelled the diagram as shown below:
To find m: 2009=100g + 25g +mg
m= 80
Took the moment about A: 100g(2) + 25g(x) + 80g (14) = 2009 (8)
1320 + 25g(x) = 16072
25g(x)= 14752
x= 60.21.. so I checked the markscheme and my answer's wrong:redface: :/
but where have I gone wrong?:s-smilie:
Original post by Adorable98


So I labelled the diagram as shown below:
To find m: 2009=100g + 25g +mg
m= 80
Took the moment about A: 100g(2) + 25g(x) + 80g (14) = 2009 (8)
1320 + 25g(x) = 16072
25g(x)= 14752
x= 60.21.. so I checked the markscheme and my answer's wrong:redface: :/
but where have I gone wrong?:s-smilie:


Where did you get the 1320 from? It's incorrrect.

Method itself looks fine.
Reply 2
Original post by ghostwalker
Where did you get the 1320 from? It's incorrrect.

Method itself looks fine.


Ojay just rechecked it I got 12.8 :smile: thanks:smile:
Original post by Adorable98


So I labelled the diagram as shown below:
To find m: 2009=100g + 25g +mg
m= 80
Took the moment about A: 100g(2) + 25g(x) + 80g (14) = 2009 (8)
1320 + 25g(x) = 16072
25g(x)= 14752
x= 60.21.. so I checked the markscheme and my answer's wrong:redface: :/
but where have I gone wrong?:s-smilie:

(100x9.8x2)+(80x9.8x14)+25gx=16072
1960 + 10976 + 25gx =16072
12936 + 25gx = 16072
25gx = 3136
x=12.8

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