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

None of these
That resultant couple must be zero
That polygon of forces must close
Both (A) and (B)

102.5 kg
110 kg
108.5 kg
105.5 kg

## Applied Mechanics and Graphic Statics A square hole is punched out of a circular lamina, the diagonal of the square being the radius of the circle. If ‘r’ is the radius of the circle, the C.G. of the remainder from the corner of the square on the circumference will be

[r (π + 0.25)]/(π + 0.5)
[r (π + 0.25)]/(π - 0.5)
[r (π - 0.5)]/(π + 0.25)
[r (π - 0.25)]/(π - 0.5)

## Applied Mechanics and Graphic Statics If a body is lying on a plane whose inclination with the horizontal is less than the angle of friction, then i. a force is required to move the body upwards ii. a force is required to move the body downward iii. the body will not be in equilibrium The correct answer is

only (i)
both (i) and (ii)
only (ii)
both (i) and (iii)

## Applied Mechanics and Graphic Statics A satellite is said to move in a synchronous orbit if it moves at an altitude of 36,000 km with a maximum velocity of about

11,000 km per hour
9000 km per hour
8000 km per hour
7000 km per hour