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Physics Question help !

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aiyla:
this question i dont know how to solve it .. can any one please help me out ?



http://i35.tinypic.com/wvrfv7.jpg
(thats the image if the above one is too small)

the question says " calculate the minimum force needed just to lift the spherical ball above the floor , the weight of the spherical ball is 50N
i did everything else on the drawing u can get the idea and the values required .

answer is F=26

the teacher said something about using equilibrium's second law .
sum of moment acting on the body= 0
clockwise moment = anti clockwise


can any one explain this question please ?

nid404:
kinda vague...astar will be able to help you

astarmathsandphysics:
Will answer it when i get home.

aiyla:
thanks alot <3

astarmathsandphysics:
see attached image.

Take moments about A.

Applied force*(10+15)=50*sqrt(175) so applied force =50*sqrt(175) /25 =26.46N

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