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Engineering Mechanics

Engineering Mechanics
The centre of percussion is below the centre of gravity of the body and is at a distance equal to

h2/kG
h × kG
h/kG
kG2/h

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Engineering Mechanics
The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

Unlike parallel forces
Like parallel forces
Coplanar concurrent forces
Coplanar non-concurrent forces

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Engineering Mechanics
The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

P = mW - C
P = m/W + C
P = mW + C
P = C - mW

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Engineering Mechanics
The moment of inertia of a solid cone of mass ‘m’ and base radius ‘r’ about its vertical axis is

2mr²/5
3mr²/5
3mr²/10
4mr²/5

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Engineering Mechanics
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG - Ah2
IP = Ah2 / IG
IP = IG / Ah2
IP = IG + Ah2

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Engineering Mechanics
If the body falls freely under gravity, then the gravitational acceleration is taken as

-8.9 m/s2
+8.9 m/s2
+9.8 m/s2
-9.8 m/s2

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