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2013 waec qustions and answers.(i)system of Lever with velocity ratio of 25 overcomes a resistance of 3300N, when an effort of 165N is applied to it.calculate the mechanical advantage and efficiency of the machine.ans is E=80%. (ii) A plane inclined at an angle of 30 degree to the horizontal has an efficiency of 50%. what is the force parallel to the plane required to push a load of 120N uniformly up the plane?the ans is E=120N (iii)Calculate the velocity ratio of a screw jack of pitch 0.3cm. if length of the Tommy bar is 21cm.ans=439.3 . NO 3 THEORY QUESTION IN PHYSICS FOR 2013 WAEC CANDITATES... we have questions and answers to all science and art subjects. call Agent 08188986075 for more information and how to get answers to all your subjects in waec and jamb