Applied Mechanics and Graphic Statics
On a mass ‘m’ describing a circular path of radius ‘r’, the centrifugal force

Acts away from the centre of rotation
Acts towards the centre of rotation
Is mw2r/g kgf
Acts tangentially to the circular path

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

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