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Engineering Mechanics

Engineering Mechanics
The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

P - Q
Q / P
P / Q
P + Q

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

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

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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

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

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Engineering Mechanics
The time of flight of a projectile on downward inclined plane depends upon

Angle of inclination of the plane
Angle of projection
Both (A) and (B)
None of these

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Engineering Mechanics
The C.G. of a solid hemisphere lies on the central radius 3r

At distance — from the plane base 3r
At distance — from the plane base 3r
At distance — from the plane base
At distance — from the plane base 3r

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Engineering Mechanics
If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,

P - m.a = 0
P × m.a = 0
P + m.a = 0
P/m.a = 0

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