## Engineering Mechanics The point, through which the whole weight of the body acts, irrespective of its position, is known as

Center of percussion
Center of gravity
Moment of inertia
Center of mass

## Engineering Mechanics The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then

Q = R
Q = 2R
P = Q
None of the listed here

## Engineering Mechanics The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

Principle of conservation of momentum
Principle of conservation of energy
Newton's first law of motion
Newton's second law of motion

## Engineering Mechanics The Cartesian equation of trajectory is (where u = Velocity of projection, α = Angle of projection, and x, y = Co-ordinates of any point on the trajectory after t seconds.)

y = x. tanα - (gx²/2u² cos²α)
y = (gx²/2u² cos²α) - x. tanα
y = x. tanα + (gx²/2u² cos²α)
y = (gx²/2u² cos²α) + x. tanα

2πN/180
2πN/60
πN/60
πN/180