Strength of Materials
The effort required to lift a load W on a screw jack with helix angle a and angle of friction<="" div="">

Wsin(a + <(>)
Wtan(a-<)>)
Wtan(a + <)>)
Wcos(a + )

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Strength of Materials
In the equation of virtual work, following force is neglected

reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
reaction of a rough surface of a body which rolls on it without slipping
All of the listed here
reaction of any smooth surface with which the body is in contact

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

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

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