Applied Mechanics and Graphic Statics
The resultant of the forces acting on a body will be zero if the body

Rotates
Moves along a curved path
Does not move at all
Moves with variable velocity in a straight line

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Applied Mechanics and Graphic Statics
The maximum displacement of a particle executing S.H.M. corresponds to

Zero kinetic energy and maximum potential energy
Minimum kinetic energy and minimum potential energy
Zero potential energy and maximum kinetic energy
Maximum kinetic energy and maximum potential energy

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Applied Mechanics and Graphic Statics
The characteristic of a couple is:

Algebraic sum of forces, constituting a couple is zero
A couple can be never the balanced by a single force
Algebraic sum of moments of forces, constituting a couple, about any point, is same
All listed here

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