Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

A uniform solid cone resting on its base on a horizontal plane
A solid cube resting on one edge
A uniform solid cone resting on a generator on a smooth horizontal plane
A satellite encircling the earth

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Applied Mechanics and Graphic Statics
One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is

None of these
a damped oscillatory motion
a simple harmonic motion
a rectilinear motion with constant speed

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Applied Mechanics and Graphic Statics
A body is said to move with Simple Harmonic Motion if its acceleration, is

Proportional to the distance from the point of reference and directed towards it
Always directed away from the centre, the point of reference
Proportional to the square of the distance from the point of reference
Inversely proportion to the distance from the point of reference

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