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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics
A hoop of radius 3 m weighs 100 kg. It rolls along a horizontal floor so that at its centre of mass has a speed of 200 mm/sec. The work required to stop the hoop is

2 J
4 J
8 J
6 J

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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
r
log r
r2

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Applied Mechanics and Graphic Statics
The piston of a steam engine moves with a simple harmonic motion. The crank rotates 120 r.p.m. and the stroke length is 2 meters. The linear velocity of the piston when it is at a distance of 0.5 metre from the centre, is

10.88 m/sec
5.88 m/sec
12.88 m/sec
8.88 m/sec

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Applied Mechanics and Graphic Statics
For a body moving with simple harmonic motion, the number of cycles per second, is known as its

Frequency
Oscillation
Amplitude
Periodic time

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Applied Mechanics and Graphic Statics
When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as

Virtual work
Negative work
Imaginary work
None of these

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Applied Mechanics and Graphic Statics
If two forces P and Q (P > Q) act on the same straight line but in opposite direction, their resultant, is

Q/P
P/Q
P + Q
P - Q

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