A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

Engineering Mechanics
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

Slant up towards direction of pull

Slant down towards direction of pull

None of these

Remain horizontal

Slant up towards direction of pull

Slant down towards direction of pull

None of these

Remain horizontal

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Engineering Mechanics
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

P = W tan (α + φ)

P = W tan (φ - α)

P = W tan (α - φ)

P = W cos (α + φ)

P = W tan (α + φ)

P = W tan (φ - α)

P = W tan (α - φ)

P = W cos (α + φ)

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Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

bh3/36

bh3/8

bh3/12

bh3/4

bh3/36

bh3/8

bh3/12

bh3/4

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Engineering Mechanics
The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

8r/3

3r/ 8

4r/ 3π

3r/4π

8r/3

3r/ 8

4r/ 3π

3r/4π

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Engineering Mechanics
The efficiency of a lifting machine is the ratio of

Output to the input

Mechanical advantage to the velocity ratio

Work done by the machine to the work done on the machine

All of these

Output to the input

Mechanical advantage to the velocity ratio

Work done by the machine to the work done on the machine

All of these

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Engineering Mechanics
The periodic time of a particle with simple harmonic motion is _________ proportional to the angular velocity.

Square root

None of these

Directly

Inversely

Square root

None of these

Directly

Inversely

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Engineering Mechanics

Engineering Mechanics In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

Engineering Mechanics Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

Engineering Mechanics The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

Engineering Mechanics The efficiency of a lifting machine is the ratio of

Engineering Mechanics The periodic time of a particle with simple harmonic motion is _________ proportional to the angular velocity.

Engineering Mechanics
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

Engineering Mechanics
The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

Engineering Mechanics
The efficiency of a lifting machine is the ratio of

Engineering Mechanics
The periodic time of a particle with simple harmonic motion is _________ proportional to the angular velocity.