## Applied Mechanics and Graphic Statics A rigid body is in a stable equilibrium if the application of any force

None of above
Neither raises nor lowers the CG of the body
Can raise the CG of the body but cannot lower it
Tends to lower the CG of the body

## 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

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

## Applied Mechanics and Graphic Statics A system of coplanar forces acting on a rigid body can be reduced to

None of these
One force only
One force and one couple only
One couple only

α = π/4 - β/2
α = β/2 - π/2
α = π/2 + β/2
α = π/4 - β/2

80
30
60
50

## Applied Mechanics and Graphic Statics Two objects moving with uniform speeds are 5 m apart after 1 second when they move towards each other and are 1 m apart when they move in the same direction. The speeds of the objects are:

4 m/sec and 6 m/sec
2 m/sec and 2 m/sec
3 m/sec and 3 m/sec
3 m/sec and 2 m/sec