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Strength of Materials

Strength of Materials
The coefficient of friction depends on

area of contact
nature of surface
strength of surfaces
shape of surfaces

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

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

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Strength of Materials
A number of forces acting at a point will be in equilibrium if

Their total sum is zero
Sum of resolved parts in any two perpendicular directions are both zero
Two resolved parts in two directions at right angles are equal
All of them are inclined equally

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Strength of Materials
A framed structure is perfect if it contains members equal to (where n = number of joints in a frame)

2n-l
n-2
2n-3
n-l

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Strength of Materials
A single force and a couple acting in the same plane upon a rigid body

are equivalent
produce moment of a couple
balance each other
cannot balance each other

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Strength of Materials
The center of gravity of a uniform lamina lies at

the mid point of its axis
the bottom surface
the center of heavy portion
All of these

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