A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is

Applied Mechanics and Graphic Statics
A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is

43839

44052

43833

43864

43839

44052

43833

43864

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Applied Mechanics and Graphic Statics
The resultant of two forces acting at right angles is 5 kgf and if they act at an angle of 60°, it is 37 kgf. The magnitudes of the forces are:

3 kgf, 4 kgf

5 kgf, 3 kgf

4 kgf, 5 kgf

2 kgf, 3 kgf

3 kgf, 4 kgf

5 kgf, 3 kgf

4 kgf, 5 kgf

2 kgf, 3 kgf

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Applied Mechanics and Graphic Statics
The centre of gravity of a trapezoidal dam section whose top width is a, bottom width is band the vertical side is a, from its vertical face is

(b² + bc + c²)/3 (b + c)

None of these

(a² + ab + c²)/3 (a + c)

(a² + ab + b²)/3 (a + b)

(b² + bc + c²)/3 (b + c)

None of these

(a² + ab + c²)/3 (a + c)

(a² + ab + b²)/3 (a + b)

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Applied Mechanics and Graphic Statics
‘u₁’ and ‘u₂’ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are ‘v₁’ and ‘v₂’. As per Newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by

e = v₂ - v₁/u₁ - u₂

e = u₂ - u₁/v₁ - v₂

e = v₁ - v₂/u₂ - u₁

e = v₁ - v₂/u₂ + u₁

e = v₂ - v₁/u₁ - u₂

e = u₂ - u₁/v₁ - v₂

e = v₁ - v₂/u₂ - u₁

e = v₁ - v₂/u₂ + u₁

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Applied Mechanics and Graphic Statics
In SI units, the units of force and energy are respectively

Newton and joule

Newton and watt

kg wt and joule

Dyne and erg

Newton and joule

Newton and watt

kg wt and joule

Dyne and erg

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Applied Mechanics and Graphic Statics
When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as

Imaginary work

Virtual work

None of these

Negative work

Imaginary work

Virtual work

None of these

Negative work

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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is

Applied Mechanics and Graphic Statics The resultant of two forces acting at right angles is 5 kgf and if they act at an angle of 60°, it is 37 kgf. The magnitudes of the forces are:

Applied Mechanics and Graphic Statics The centre of gravity of a trapezoidal dam section whose top width is a, bottom width is band the vertical side is a, from its vertical face is

Applied Mechanics and Graphic Statics In SI units, the units of force and energy are respectively

Applied Mechanics and Graphic Statics When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as

Applied Mechanics and Graphic Statics
A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is

Applied Mechanics and Graphic Statics
The resultant of two forces acting at right angles is 5 kgf and if they act at an angle of 60°, it is 37 kgf. The magnitudes of the forces are:

Applied Mechanics and Graphic Statics
The centre of gravity of a trapezoidal dam section whose top width is a, bottom width is band the vertical side is a, from its vertical face is

Applied Mechanics and Graphic Statics
In SI units, the units of force and energy are respectively

Applied Mechanics and Graphic Statics
When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as