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Engineering Mechanics

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

3mr²/10
2mr²/5
3mr²/5
4mr²/5

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Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Away from the wall at its upper end
Downward at its upper end
Upward at its upper end
Towards the wall at its upper end

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Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

tanα/tan (α + φ)
None of these
tan(α - φ)/tanα
tan(α + φ)/tanα

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Engineering Mechanics
The moment of inertia of a thin rod of mass 'm' and length 'l', about an axis through its centre of gravity and perpendicular to its length is

ml2/4
ml2/ 6
ml2/8
ml2/12

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

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

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Engineering Mechanics
A screw jack used for lifting the loads is

A non-reversible machine
An ideal machine
A reversible machine
None of these

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