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Pressure

In the pin-jo...

Question

In the pin-jointed plane truss shown below, magnitude of force in member ED is ________KN.

20

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Solution

The correct option is A 20

$F_{B C} = F_{C D} = 0 F_{B D} = 20 K N$
At joint D, $F_{A D} c o s 30 = F_{E D} c o s 30 \Rightarrow F_{A D} = F_{E D} F_{A D} c o s 60 + F_{E D} c o s 60 = 20 F_{E D} = 20 K N$

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