Civil Engineering :: Strength of Materials - Civil Engineering
- The algebraic sum of moments of the forces forming couple about any point in their plane is
- A force acting on a body may
- The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of
- When trying to turn a key into a lock, following is applied
- Which is the correct statement about law of polygon of forces ?
- The effort required to lift a load W on a screw jack with helix angle a and angle of friction<="" div="">
- In actual machines
- A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if
- The C.G. of a right circular solid cone of height h lies at the following distance from the base
- According to principle of moments
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A.
if any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium |
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B.
if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium |
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C.
if a polygon representing forces acting at a point is closed then forces are in equilibrium |
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D.
if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium |
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A.
if a system of coplanar forces is in equilibrium, then their algebraic sum is zero |
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B.
if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero |
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C.
the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point |
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D.
positive and negative couples can be balanced |