A square pin jointed truss is subjected to a load P. acting

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A square pin jointed truss is subjected to a load P. acting in the direction of member US, at joint U. The force in member UR is

1. 1.414 P
2. 1.000 P
3. 0.707 P
4. 0.000 P

Correct Option: D

Member UR is a zero force member.