engineering mechanics doubt

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engineering mechanics doubt

Postby kirankumarreddy » Wed Aug 01, 2012 7:17 am

book 2 ,1st chapter ;level 1 ; 25th que - from where the force f1 came from ? ; 26th que what is inertia frame ; 30 th que why reaction force is not there in the bearing ;33rd how is that tension is equal to body weight?
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Re: engineering mechanics doubt

Postby maulik007 » Tue Aug 14, 2012 7:46 pm

Q-25:
It is the ladder which is slipping down so the point-1 will move leftwards. force F1 is the friction force which is acting in direction opposite to its motion. so it is shown rightwards.

Q-33;
draw a perpendicular from A to line BC.
now in right angle triangle AMB, sin30=AM/AB.
=> AM = AB*sin30
=>AM = AB/2 .......(1)
FORCES:
(1) tension in BC = T
(2) weight=100 kg at midpoint(C.G.) of AB.
now,
take moment @ point-A.
=> T*AM= weight* AB/2
but from (1) AM= AB/2
=> T*AB/2 = weight *AB/2
=> T= weight

OK?
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