Applied Mechanics and Graphic Statics
To double the period of oscillation of a simple pendulum

Its length should be doubled
Its length should be quadrupled
The mass of its bob should be doubled
The mass of its bob should be quadrupled

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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

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

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Applied Mechanics and Graphic Statics
Lami's theorem states that

Three forces acting at a point are always in equilibrium
If three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium
Three coplanar forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two
Three coplanar forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two

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Applied Mechanics and Graphic Statics
Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

Is directly proportional to their velocity of approach
Bears a constant ratio to their velocity of approach
Is inversely proportional to their velocity of approach
Is equal to the sum of their velocities of approach

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