Physics-
General
Easy
Question
A smooth semicircular tube AB of radius r is fixed in a vertical plane and contains a heavy flexible chain of length 
and weight per unit length 'w' as shown. Assuming a slight disturbance to start the chain. in motion, the velocity v with which it will emerge from the open end B of the tube is
The correct answer is:
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Two persons of mass 
and 
are standing at the two ends A and B respectively of a trolley of mass M as shown When both the persons jump simultaneously with same speed then:
Two persons of mass and are standing at the two ends A and B respectively of a trolley of mass M as shown When both the persons jump simultaneously with same speed then:
physics-General
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From the previous question in the reference frame attached to the center f inertia, the total kinetic energy of the two particles is
From the previous question in the reference frame attached to the center f inertia, the total kinetic energy of the two particles is
physics-General
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A closed system consists of two particles of masses and which move at right angles to each other with velocities 
and 
. In the reference frame attached to the center of inertia, the magnitude of momentum of each particle is
A closed system consists of two particles of masses and which move at right angles to each other with velocities and . In the reference frame attached to the center of inertia, the magnitude of momentum of each particle is
physics-General
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A man of mass m is standing on a platform of mass M kept on smooth ice. If the man starts moving on the platform with a speed v relative to the platform, with what velocity relative to the ice does the platform recoil?
A man of mass m is standing on a platform of mass M kept on smooth ice. If the man starts moving on the platform with a speed v relative to the platform, with what velocity relative to the ice does the platform recoil?
physics-General
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A boy having a mass of M kg stands at one end A of a boat of length dm at rest. The boy walks to the other end B of the boat with a velocity u relative to the boat. What is the velocity of the boat? Friction exists between the feet of the boy and the surface of the boat. But the friction between the boat and the water surface may be neglected. Mass of the boat is 4 m
A boy having a mass of M kg stands at one end A of a boat of length dm at rest. The boy walks to the other end B of the boat with a velocity u relative to the boat. What is the velocity of the boat? Friction exists between the feet of the boy and the surface of the boat. But the friction between the boat and the water surface may be neglected. Mass of the boat is 4 m
physics-General
physics-
A equilateral triangular, square and circular plates of same thickness and made up of different materials are arranged is shown in figure.
The ratio of their respective densities are 
. The centre of mass of the arrangement lies
A equilateral triangular, square and circular plates of same thickness and made up of different materials are arranged is shown in figure.
The ratio of their respective densities are . The centre of mass of the arrangement lies
physics-General
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The centre of mass of a triangular lamina of uniform density of height h is
The centre of mass of a triangular lamina of uniform density of height h is
physics-General
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A semi-circular plate of radius R has density 
, where 
is the distance from centre. The position of centre of mass from 0 is
A semi-circular plate of radius R has density , where is the distance from centre. The position of centre of mass from 0 is
physics-General
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A semi-circular plate with cavity having inner radius R and outer radius 2R with uniform density is a shown. The centre of mass of the thin plate is at
A semi-circular plate with cavity having inner radius R and outer radius 2R with uniform density is a shown. The centre of mass of the thin plate is at
physics-General
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A rod AB of length 10 cm, has its mass per unit length varying from 1 kg/m cat end A ) to 2Kg/m ( at end B). The distance of centre of mass from end B is :
A rod AB of length 10 cm, has its mass per unit length varying from 1 kg/m cat end A ) to 2Kg/m ( at end B). The distance of centre of mass from end B is :
physics-General
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If a square of side R/2 is removed from a uniform circular disc of radius R as shown in the figure, the shift in centre of mass is
If a square of side R/2 is removed from a uniform circular disc of radius R as shown in the figure, the shift in centre of mass is
physics-General
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If a triangular sheet is removed from one edge of a uniform rectangular sheet as shown in the figure, then the shift in the centre of mass of the system is
If a triangular sheet is removed from one edge of a uniform rectangular sheet as shown in the figure, then the shift in the centre of mass of the system is
physics-General
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The co-ordinates of centre of mass of letter E which is cut from a uniform metal sheet are (Take origin at bottom left corner and width of letter 2 cm every where)
The co-ordinates of centre of mass of letter E which is cut from a uniform metal sheet are (Take origin at bottom left corner and width of letter 2 cm every where)
physics-General
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Two blocks of equal mass are tied with a light string which passes over a massless pulley as shown in figure. The magnitude of acceleration of centre of mass of both the blocks is (neglect friction everywhere)
Two blocks of equal mass are tied with a light string which passes over a massless pulley as shown in figure. The magnitude of acceleration of centre of mass of both the blocks is (neglect friction everywhere)
physics-General
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The centre of mass coordinates of a block of shape shown in fig. is
The centre of mass coordinates of a block of shape shown in fig. is
physics-General
