Q. The angle of the inclined plane at which a body just begins to slide down the plane, is called helix angle.

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Q. According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through centre of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

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Q. The resultant of two equal forces P making an angle θ, is given by

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Q. The force, by which the body is attracted, towards the centre of the earth, is called

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Q. Coplaner concurrent forces are those forces which

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Q. The power developed by a body acted upon by a torque T newton metre (N - m) and revolving at ω radian/s is given by

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Q. When two elastic bodies collide with each other,

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Q. The centre of gravity of a triangle lies at a point where its medians intersect each other.

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Q. In order to double the period of simple pendulum, the length of the string should be

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Q. The moment of inertia of a square of side a about its base is a⁴/ 3.

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Q. If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys

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Q. The time of flight (t) of a projectile on a horizontal plane is given by

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Q. The velocity ratio for the third system of pulleys is

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Q. If the gravitational acceleration at any place is doubled, then the weight of a body will be

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Q. The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

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Q. The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

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Q. Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

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Q. If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

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

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Q. When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.

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