Applied Mechanics and Graphic Statics
If the resultant of two forces ‘P’ and ‘Q’ acting at an angle ‘θ’ makes an angle ‘α’ with ‘P’, then tan α equals

P sin θ/P - Q cos θ
Q sin θ/P + Q cos θ
Q sin θ/P + Q sin θ
P sin θ/P + Q tan θ

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Applied Mechanics and Graphic Statics
Free body diagram is an

Isolated joint with only body forces acting on it
None of these
Isolated joint with internal forces acting on it
Isolated joint with all the forces, internal as well as external, acting on it

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Applied Mechanics and Graphic Statics
The phenomenon of collision of two elastic bodies takes place because bodies

All listed here
Tend to compress each other till they are compressed maximum possible
Attempt to regain its original shape due to their elasticities
Immediately after collision come momentarily to rest

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