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Engineering Mechanics

Engineering Mechanics
Moment of inertia of a circular section about an axis perpendicular to the section is

πd3/16
πd4/32
πd4/64
πd3/32

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Engineering Mechanics
The time of flight (t) of a projectile on a horizontal plane is given by

t = 2u. sinα/g
t = 2u. cosα/g
t = 2u/g.sinα
t = 2u. tanα/g

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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
v/4
v/2
v/8

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Engineering Mechanics
If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.

Changes periodically
None of these
Does not change
Change

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Engineering Mechanics
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

Newton's third law of motion
None of these
Newton's second law of motion
Newton's first law of motion

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Engineering Mechanics
The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

D / d
D × d
D + d
D - d

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