Strength of Materials
The weight of a body is due to

force of attraction experienced by par-ticles
gravitational force of attraction towards the centre of the earth.
gravitational pull exerted by the earth
centripetal force of earth

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Strength of Materials
Which one of the following statements is not correct

the tangent of the angle of repose is equal to coefficient of friction
the tangent of the angle of friction is equal to coefficient of friction
the sine of the angle of repose is equal to coefficient to friction
the angle of repose is equal to angle of friction

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Strength of Materials
In actual machines

mechanical advantage is equal to velocity ratio
mechanical advantage is unity
mechanical advantage is less than velocity ratio
mechanical advantage is greater than velocity ratio

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