Maximum efficiency of a screw jack for the angle of friction θ, is

Applied Mechanics and Graphic Statics
Maximum efficiency of a screw jack for the angle of friction θ, is

(1 - sin θ)/sin θ

sin θ/(1 + sin θ)

(1 + sin θ)/(1 - sin θ)

(1 - sin θ)/(1 + sin θ)

(1 - sin θ)/sin θ

sin θ/(1 + sin θ)

(1 + sin θ)/(1 - sin θ)

(1 - sin θ)/(1 + sin θ)

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Applied Mechanics and Graphic Statics
A ladder of weight 'w' rests against a smooth vertical wall, and rests on rough horizontal ground, the coefficient of friction between the ladder and the ground being 1/4. The maximum angle of inclination of the ladder to the vertical, if a man of weight 'w' is to walk to the top of it safely, is tan'1 x, where x is

4

43833

43834

3

4

43833

43834

3

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Applied Mechanics and Graphic Statics
In a simple harmonic motion, the position of equilibrium is always

Neutral

None of these

Stable

Unstable

Neutral

None of these

Stable

Unstable

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Applied Mechanics and Graphic Statics
Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down

Rubber and lead balls undergo equal changes in momentum

Momentum of rubber ball is less than that of lead ball

None of these

Change in momentum suffered by lead ball is less that of rubber ball

Rubber and lead balls undergo equal changes in momentum

Momentum of rubber ball is less than that of lead ball

None of these

Change in momentum suffered by lead ball is less that of rubber ball

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Applied Mechanics and Graphic Statics
The following statement is one of the laws of Dynamic friction

The force of friction always acts in a direction opposite to that in which a body is moving

All of these

The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction

For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed

The force of friction always acts in a direction opposite to that in which a body is moving

All of these

The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction

For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed

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Applied Mechanics and Graphic Statics
The condition of equilibrium for any system of forces in a plane is

That resultant couple must be zero

Both (A) and (B)

None of these

That polygon of forces must close

That resultant couple must be zero

Both (A) and (B)

None of these

That polygon of forces must close

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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics Maximum efficiency of a screw jack for the angle of friction θ, is

Applied Mechanics and Graphic Statics In a simple harmonic motion, the position of equilibrium is always

Applied Mechanics and Graphic Statics Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down

Applied Mechanics and Graphic Statics The following statement is one of the laws of Dynamic friction

Applied Mechanics and Graphic Statics The condition of equilibrium for any system of forces in a plane is

Applied Mechanics and Graphic Statics
Maximum efficiency of a screw jack for the angle of friction θ, is

Applied Mechanics and Graphic Statics
In a simple harmonic motion, the position of equilibrium is always

Applied Mechanics and Graphic Statics
Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down

Applied Mechanics and Graphic Statics
The following statement is one of the laws of Dynamic friction

Applied Mechanics and Graphic Statics
The condition of equilibrium for any system of forces in a plane is