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Engineering Mechanics

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

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

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Engineering Mechanics
In order to completely specify angular displacement by a vector, it must fix

Magnitude of angular displacement
All of these
Sense of angular displacement
Direction of the axis of rotation

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Engineering Mechanics
An ideal machine is one whose efficiency is

Between 80 and 90%
Between 60 and 70 %
1
Between 70 and 80%

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Engineering Mechanics
The overturning of a vehicle on a level circular path can be avoided if the velocity of vehicle is __________ √(gra/h)

None of these
Less than
Greater than
Equal to

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Engineering Mechanics
The maximum efficiency of a screw jack is

(1 + tanφ)/(1 - tanφ)
(1 + sinφ)/(1 - sinφ)
(1 - sinφ)/(1 + sinφ)
(1 - tanφ)/(1 + tanφ)

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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

0.5 Iω2
Iω2
0.5 Iω
Iω

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