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Engineering Mechanics

Engineering Mechanics
A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

Non-reversible
Ideal
None of these
Reversible

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Engineering Mechanics
If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,

P × m.a = 0
P - m.a = 0
P + m.a = 0
P/m.a = 0

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Engineering Mechanics
The forces, which meet at one point and their lines of action also lie on the same plane, are known as

Coplanar concurrent forces
Non-coplanar non-concurrent forces
Non-coplanar concurrent forces
Coplanar non-concurrent forces

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Engineering Mechanics
A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)

None of these
MS/4
MS/3
MS/5

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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

mgv2
mv2
0.5 mv2
0.5 mgv2

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Engineering Mechanics
In order to double the period of simple pendulum, the length of the string should be

Doubled
None of these
Halved
Quadrupled

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