Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions)
A machinist starts with three identical square plates but cuts one corner from one of them, two corners from the second and three corners from the third. Rank the three according to the x-coordinate of their centre of mass, from smallest to largest.
20
Sep
A machinist starts with three identical square plates but cuts one corner from one of them, two corners from the second and three corners from the third. Rank the three according to the x-coordinate of their centre of mass, from smallest to largest. A machinist starts with three identical square plates but cuts one corner [...]
An object comprises of a uniform ring of radius R and its uniform chord AB (not necessarily made of the same material) as shown. Which of the following can not be the centre of mass of object
20
Sep
An object comprises of a uniform ring of radius R and its uniform chord AB (not necessarily made of the same material) as shown. Which of the following can not be the centre of mass of object An object comprises of a uniform ring of radius R and its uniform chord AB (not necessarily made [...]
A piece of paper fig. a is in form of a square. now an arrow sign is made by cutting and rejoining a quater part of the square of side L as shown. If O is taken to be origin ( 0,0 ) , the centre of mass of fig. (b) will be at
20
Sep
A piece of paper fig. a is in form of a square. now an arrow sign is made by cutting and rejoining a quater part of the square of side L as shown. If O is taken to be origin ( 0,0 ) , the centre of mass of fig. (b) will be at 0 [...]
Two planks A and B are sliding in the same direction on smooth horizonmtal surface such that A is faster than B. packets of equal weight are transferred from A to B . Due to this
20
Sep
Two planks A and B are sliding in the same direction on smooth horizonmtal surface such that A is faster than B. packets of equal weight are transferred from A to B . Due to this Two planks A and B are sliding in the same direction on smooth horizonmtal surface such that A is [...]
A body falling vertically downwards under gravity breaks in two parts of unequal masses. The centre of mass of the two parts together shifts horizontally towards
20
Sep
A body falling vertically downwards under gravity breaks in two parts of unequal masses. The centre of mass of the two parts together shifts horizontally towards A body falling vertically downwards under gravity breaks in two parts of unequal masses. The centre of mass of the two parts together shifts horizontally towards September 20, 2020 [...]
A man of mass m is standing on a plank of mass M kept on a rough surface. When the man walks from left to right on the plank, the centre of mass ( man + plank ) of the system
20
Sep
A man of mass m is standing on a plank of mass M kept on a rough surface. When the man walks from left to right on the plank, the centre of mass ( man + plank ) of the system A man of mass m is standing on a plank of mass M kept [...]
A hemisphere of radius R and mass 4 m is free to slide with its base on a smooth horizontal table . A particle of mass m is placed on the top of the hemisphere . The angular velocity of the particle relative to centre of hemisphere at an angular displacement θ when velocity of hemisphere has become v is
20
Sep
A hemisphere of radius R and mass 4 m is free to slide with its base on a smooth horizontal table . A particle of mass m is placed on the top of the hemisphere . The angular velocity of the particle relative to centre of hemisphere at an angular displacement θ when velocity of [...]
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In figure a man stands on a boat floating in still water. The mass of the man and the boat is 60 kg and 120 kg ,
respectively. a. If the man walks to the front of the boat and stops. what is the separation between the boat and the pier now? b. If the man moves at a constant speed of 3m/s relative to the boat ,
what is the total kinetic energy of the system (boat + man)? Compare this energy with the kinetic energy of the system if the boat was tied to the pier. ,
A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface and fires 10 shots horizontally. Each bullet. has a mass 10 g and a muzzle velocity of 800 m/s, a. What velocity does the rifle man acquire at the end of 10 shots? b. If the shots are fired in 10 s, what will he the average force exerted on him? c. Compare his kinetic energy with that of 10 bullets
20
Sep
A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface and fires 10 shots horizontally. Each bullet. has a mass 10 g and a muzzle velocity of 800 m/s, a. What velocity does the rifle man acquire at the end of 10 shots? b. If the [...]
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A rifle man ,
a. What velocity does the rifle man acquire at the end of 10 shots? b. If the shots are fired in 10 s ,
stands on a smooth surface and fires 10 shots horizontally. Each bullet. has a mass 10 g and a muzzle velocity of 800 m/s ,
what will he the average force exerted on him? c. Compare his kinetic energy with that of 10 bullets ,
who together with his rifle has a mass of 100 kg ,
Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them and the blocks are pushed together with the spring between them. A cord initially holding the blocks together is burned, after that, the block of mass 3M moves to the right with a speed of 2.00m/s. (a) What is the velocity of the block of mass M. (b) Find the system’s original elastic potential energy, taking M=0.350kg. (c) Is the original energy in the spring or in the cord? Explain your answer. (d) Is momentum of the system conserved in the bursting apart process? How can it be with large forces acting? How can it be with no motion beforehand and plenty of motion afterward?
20
Sep
Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them and the blocks are pushed together with the spring between them. A cord initially holding the blocks together is burned, after that, the block of mass 3M moves to the right with [...]
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after that ,
frictionless surface. A light spring is attached to one of them and the blocks are pushed together with the spring between them. A cord initially holding the blocks together is burned ,
In figure a man stands on a boat floating in still water. The mass of the man and the boat is 60 kg and 120 kg ,
respectively. a. If the man walks to the front of the boat and stops. what is the separation between the boat and the pier now? b. If the man moves at a constant speed of 3m/s relative to the boat ,
the block of mass 3M moves to the right with a speed of 2.00m/s. (a) What is the velocity of the block of mass M. (b) Find the system's original elastic potential energy ,
Two blocks of masses M and 3M are placed on a horizontal ,
what is the total kinetic energy of the system (boat + man)? Compare this energy with the kinetic energy of the system if the boat was tied to the pier. ,
An 80 kg boy and his 40 kg sister, both wearing roller blades, face each other at rest. The girl pushes the boy hard, sending him backward with velocity 3.0 m/s towards the west. Ignore friction, (a) Describe the subsequent motion of the girl. (b) How much chemical energy is converted into mechanical energy in the girl’s muscles? (c) Is the momentum of the boy-girl system conserved in the pushing apart process? How can it he with no motion beforehand and plenty of motion afterward?
20
Sep
An 80 kg boy and his 40 kg sister, both wearing roller blades, face each other at rest. The girl pushes the boy hard, sending him backward with velocity 3.0 m/s towards the west. Ignore friction, (a) Describe the subsequent motion of the girl. (b) How much chemical energy is converted into mechanical energy in [...]
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An 80 kg boy and his 40 kg sister ,
both wearing roller blades ,
face each other at rest. The girl pushes the boy hard ,
In figure a man stands on a boat floating in still water. The mass of the man and the boat is 60 kg and 120 kg ,
respectively. a. If the man walks to the front of the boat and stops. what is the separation between the boat and the pier now? b. If the man moves at a constant speed of 3m/s relative to the boat ,
sending him backward with velocity 3.0 m/s towards the west. Ignore friction ,
what is the total kinetic energy of the system (boat + man)? Compare this energy with the kinetic energy of the system if the boat was tied to the pier. ,