A 13 m ladder is placed against a
smooth vertical wall with its lower end 5 m from the wall. What should be the
coefficient of friction between the ladder and floor so that it remains in
equilibrium?
एक 13 मीटर लंबी सीढ़ी को एक चिकनी ऊर्ध्वाधर दीवार के सामने रखा गया है जिसका निचला सिरा दीवार से 5 मीटर दूर है। सीढ़ी और फर्श के बीच घर्षण का गुणांक क्या होना चाहिए ताकि यह संतुलन में रहे?
0.1
0.15
0.218
None of these
0.218
Given :Length of the ladder (l) = 13m
Distance between wall and lower end (x) = 5m
Now, resolving horizontal forces,
Resolving vertical forces,
Putting value of NA from equation (i),
Taking moment about A,
Hence, the correct option is (C).
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