Q. The angle which an inclined surface makes with the horiontal when a body placed on it is on the point of moving down, is called

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Q. Work may be defined as

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Q. The centre of gravity of a triangle is at the point where three

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Q. The forces which meet at one point and have their lines of action in different planes are called

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Q. At a given instant ship A is travelling at 6 km/h due east and ship B is travelling at 8 km/h due north. The velocity of B relative to A is

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Q. The equation of motion of a particle starting from rest along a straight line is x = t³ - 3t² + 5. The ratio of the accelerations after 5 sec and 3 sec will be

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Q. The locus of the instantaneous centre of a moving rigid body, is

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Q. If three rigid rods are hinged together to form a triangle and are given rotary as well as translatory motion, the number of instantaneous centres of the triangle, will be

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Q. The mechanical advantage of an ideal machine is 100. For moving the local through 2 m, the effort moves through

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Q. When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as

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Q. To attain the synchronous orbit, the launch of a satellite, is done from a place

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Q. A bullet weighing 200 g is fired horizontally with a velocity of 25 m/sec from a gun carried on a carriage which together with the gun weighs 100 kg. The velocity of recoil of the gun, will be

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Q. The tension in a cable supporting a lift

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Q. A satellite moves in its orbit around the earth due to

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Q. If g1 and g2 are the gravitational accelerations on two mountains A and B respectively, the weight of a body when transported from A to B will be multiplied by

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Q. A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is

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Q. A string of length 90 cm is fastened to two points A and B at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force P is applied to the ring such that it is in equilibrium vertically below B. The value of P is :

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Q. Ball A of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball B on the table. If the impact is perfectly elastic, the velocity of the ball B just after impact would be

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Q. Equation of motion of a point in a straight line, is

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Q. One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The tension in the string is

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