Engineering Mechanics
In order to completely specify angular displacement by a vector, it must fix

Direction of the axis of rotation
Sense of angular displacement
Magnitude of angular displacement
All of these

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Engineering Mechanics
Which of the following statement is correct in connection with projectiles?

A path, traced by a projectile in the space, is known as trajectory.
The velocity, with which a projectile is projected, is known as the velocity of projection.
All of these
The angle, with the horizontal, at which a projectile is projected, is known as angle of projection.

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Engineering Mechanics
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

None of these
Slant down towards direction of pull
Slant up towards direction of pull
Remain horizontal

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