Applied Mechanics and Graphic Statics
The member forces in a statically in determinate truss

Can be obtained by graphic statics by trial and error
Cannot be obtained by graphic statics
Can be obtained by graphic statics
May be obtained by graphic statics

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Applied Mechanics and Graphic Statics
The angle of friction is:

The angle between the normal reaction and the resultant of normal reaction and limiting friction
The force of friction when the body is in motion
The ratio of the friction and the normal reaction
The force of friction at which the body is just about to move

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