Which is the correct statement about law of polygon of forces?

Engineering Mechanics
Which is the correct statement about law of polygon of forces?

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

If a polygon representing forces acting at a point is closed then forces are in equilibrium

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

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

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

If a polygon representing forces acting at a point is closed then forces are in equilibrium

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

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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Engineering Mechanics
When two elastic bodies collide with each other,

The two bodies tend to compress and deform at the surface of contact

The two bodies will momentarily come to rest after collision

All of these

The two bodies begin to regain their original shape

The two bodies tend to compress and deform at the surface of contact

The two bodies will momentarily come to rest after collision

All of these

The two bodies begin to regain their original shape

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Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

tan(α + φ)/tanα

None of these

tan(α - φ)/tanα

tanα/tan (α + φ)

tan(α + φ)/tanα

None of these

tan(α - φ)/tanα

tanα/tan (α + φ)

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Engineering Mechanics
If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be

Minimum

Zero

Maximum

Infinity

Minimum

Zero

Maximum

Infinity

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Engineering Mechanics
Which of the following statement is incorrect?

The ratio of the limiting friction to the normal reaction is called coefficient of friction

The velocity ratio of a machine is the ratio of load lifted to the effort applied

A force acting in the opposite direction to the motion of the body is called force of friction

A machine whose efficiency is 100% is known as an ideal machine

The ratio of the limiting friction to the normal reaction is called coefficient of friction

The velocity ratio of a machine is the ratio of load lifted to the effort applied

A force acting in the opposite direction to the motion of the body is called force of friction

A machine whose efficiency is 100% is known as an ideal machine

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Engineering Mechanics
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as

None of these

Principle of resolution of forces

Principle of transmissibility of forces

Principle of independence of forces

None of these

Principle of resolution of forces

Principle of transmissibility of forces

Principle of independence of forces

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Engineering Mechanics

Engineering Mechanics Which is the correct statement about law of polygon of forces?

Engineering Mechanics When two elastic bodies collide with each other,

Engineering Mechanics Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

Engineering Mechanics If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be

Engineering Mechanics Which of the following statement is incorrect?

Engineering Mechanics The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as

Engineering Mechanics
Which is the correct statement about law of polygon of forces?

Engineering Mechanics
When two elastic bodies collide with each other,

Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

Engineering Mechanics
If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be

Engineering Mechanics
Which of the following statement is incorrect?

Engineering Mechanics
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as