Mechanics
- When a ship floats on water
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According to Archimedes's principle when a body is immersed fully or partially in a liquid, it experiences an upward force that is equal to the weight of the fluid displaced by it therefore the mass of water displaced is equal to the mass of the ship.
Correct Option: B
According to Archimedes's principle when a body is immersed fully or partially in a liquid, it experiences an upward force that is equal to the weight of the fluid displaced by it therefore the mass of water displaced is equal to the mass of the ship.
- A body is thrown vertically upwards and then falls back on the ground. Its potential energy is maximum
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We know that
potential energy = mgh
Hence potential energy is maximum at the maximum height.Correct Option: B
We know that
potential energy = mgh
Hence potential energy is maximum at the maximum height.
- A book is kept on the surface of a table. If the gravitational pull of the earth on the book is the force of action, then the force of reaction is exerted by
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If the gravitational pull of the earth on the book is the force of action, then the force of reaction is exerted by the table on the book.
Correct Option: C
If the gravitational pull of the earth on the book is the force of action, then the force of reaction is exerted by the table on the book.
- A long jumper runs before jumping because he
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A long jumper runs before jumping because to maintain momentum conservation or to increase initial speed.
Correct Option: B
A long jumper runs before jumping because to maintain momentum conservation or to increase initial speed.
- A jet engine works on the principle of conservation of
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linear momentum
Correct Option: A
linear momentum