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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics
Three forces which act on a rigid body to keep it in equilibrium. The forces must be coplanar and

Concurrent
Parallel
None of these
Concurrent parallel

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Applied Mechanics and Graphic Statics
A block of weight 50 kg is placed on a horizontal plane. When a horizontal force of 18 kg is applied, the block is just on the point of motion. The angle of friction is

20° 48'
18° 48'
19° 48'
17° 48'

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Applied Mechanics and Graphic Statics
M.I. of solid sphere, is

½ Mr²
Mr²
⅔ Mr²
πr4/2

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Applied Mechanics and Graphic Statics
If a body is lying on a plane whose inclination with the horizontal is less than the angle of friction, then i. a force is required to move the body upwards ii. a force is required to move the body downward iii. the body will not be in equilibrium The correct answer is

only (ii)
only (i)
both (i) and (iii)
both (i) and (ii)

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Applied Mechanics and Graphic Statics
A simple pendulum of length 1 has an energy E when its amplitude is A. If its amplitude is increased to 2A, the energy becomes

2E
E
4E
E/2

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Applied Mechanics and Graphic Statics
The potential energy of a particle falling through a straight shaft drilled through the earth (assumed homogenous and spherical) is proportional to (where r is the distance of’the particle from centre of the earth)

1/r
log r
r2
r

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