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Engineering Mechanics

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

πd4/64
πd3/16
πd3/32
πd4/32

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Engineering Mechanics
When a body of mass moment of inertia 'I' (about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is

Iω2
0.5 Iω2
0.5 Iω
Iω

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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/4
v/2
v
v/8

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Engineering Mechanics
In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is

50
400
200
100

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Engineering Mechanics
The unit of moment of inertia of an area is

kg-m-s2
m4
kg-m2
kg/m2

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Engineering Mechanics
If a number of forces are acting at a point, their resultant is given by

(∑V)2 +(∑H)2 +2(∑V)(∑H)
√[(∑V)2 +(∑H)2 +2(∑V)(∑H)]
√[(∑V)2 + (∑H)2]
(∑V)2 + (∑H)2

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