Engineering Mechanics
A machine having an efficiency greater than 50%, is known as

Non-reversible machine
Ideal machine
Reversible machine
Neither reversible nor non-reversible machine

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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.)

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

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Engineering Mechanics
The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

The algebraic sum of the resolved parts of the forces in the given direction
The sum of the forces multiplied by the sine of θ
The sum of the resolved parts of the forces in the given direction
The difference of the forces multiplied by the cosine of θ

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