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

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

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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
The loss of kinetic energy during inelastic impact, is given by (where m1 = Mass of the first body,m2 = Mass of the second body, and u1 and u2 = Velocities of the first and second bodies respectively.)

[m₁ m₂/2(m₁ + m₂)] (u₁ - u₂)²
[2(m₁ + m₂)/m₁ m₂] (u₁² - u₂²)
[m₁ m₂/2(m₁ + m₂)] (u₁² - u₂²)
[2(m₁ + m₂)/m₁ m₂] (u₁ - u₂)²

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Engineering Mechanics
One joule means that

Work is done by a force of 1 g when it displaces a body through 1 cm
Work is done by a force of 1 kg when it displaces a body through 1 m
Work is done by a force of 1 N when it displaces a body through 1 m
Work is done by a force of 1 dyne when it displaces a body through 1 cm

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