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Q.

A uniform ladder of mass 10 kg leans against a smooth vertical wall making an angle 53° with it. The other end rests on a rough horizontal floor. Find the normal force and the frictional force that the floor exerts on the ladder

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a

30 N

b

65 N

c

50 N

d

120 N

answer is B.

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Detailed Solution

Question Image

The ladder is in equilibrium
N1=f and N2=W
Taking torque about ‘B’
N1(AO)=W(CB) (or) N1(AB)cos53=WAB2sin53
 (or) N1=22W and N2=W=10×9.8=98Nf=N1=23W=65N

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