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

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

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Engineering Mechanics
A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

Both the balls undergo an equal change in momentum
The change in momentum suffered by rubber ball is less than the lead ball
None of these
The change in momentum suffered by rubber ball is more than the lead ball

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Engineering Mechanics
Which is the correct statement about law of polygon of forces?

If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
If a polygon representing forces acting at a point is closed then forces are in equilibrium

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Engineering Mechanics
Coplanar concurrent forces are those forces which

Meet at one point and their lines of action also lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane

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