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Engineering Mechanics

Engineering Mechanics
The periodic time (T) is given by (where, ω = Angular velocity of particle in rad/s.)

π/ω
ω/2π
2π/ω
2π × ω

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Engineering Mechanics
When a body of mass 'm' attains a velocity 'v' from rest in time 't', then the kinetic energy of translation is

mv2
mgv2
0.5 mgv2
0.5 mv2

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Engineering Mechanics
For a self locking machine, the efficiency must be

1
Equal to 50%
Less than 50%
Greater than 50%

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Engineering Mechanics
Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity ‘v’ is made to strike the second ball. Both the balls after impact will move with a velocity

v/8
v/4
v/2
v

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Engineering Mechanics
Moment of inertia of a circular section about its diameter (d) is

πd4/64
πd4/32
πd3/32
πd3/16

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Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Upwards at its upper end
Perpendicular to the wall at its upper end
Zero at its upper end
Downwards at its upper end

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