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# physicsquestions

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A cork is floating in water. What is the apparent weight of the cork?
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A cork is floating in water. What is the apparent weight of the cork?

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A helium filled balloon rises to a certain height and then halts. Why?
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A helium filled balloon rises to a certain height and then halts. Why?

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Steel balls sink in water but they don’t sink in mercury. Why?
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Steel balls sink in water but they don’t sink in mercury. Why?

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Why is the bottom of a ship made heavy?
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Why is the bottom of a ship made heavy?

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Does a ship sink more in river water or in sea water? Explain.
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Does a ship sink more in river water or in sea water? Explain.

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What are centre of buoyancy and metacentre?
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What are centre of buoyancy and metacentre?

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If a cork is released from the bottom of a jar filled with water, what will happen and why?
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If a cork is released from the bottom of a jar filled with water, what will happen and why?

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What is the counterpart of the mass and force in rotational motion?
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What is the counterpart of the mass and force in rotational motion?

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A rigid, lighter than air balloon filled with Helium cannot continue to rise indefinitely. Why?
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A rigid, lighter than air balloon filled with Helium cannot continue to rise indefinitely. Why?

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Suppose two forces act on rigid body and two forces have same magnitude but opposite direction. what conditions the body rotate?
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Suppose two forces act on rigid body and two forces have same magnitude but opposite direction. what conditions the body rotate?

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Why is a horse more stable than a man?
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Why is a horse more stable than a man?

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A dancer girl is rotating over a turntable with her arms outstretched. If she lowers her arms how does this affect her motion?
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A dancer girl is rotating over a turntable with her arms outstretched. If she lowers her arms how does this affect her motion?

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On what factors does the time period of a simple pendulum depend?
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On what factors does the time period of a simple pendulum depend?

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A fan with blades takes longer time to come to rest than without the blades. Why?
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A fan with blades takes longer time to come to rest than without the blades. Why?

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Why bridges are declared unsafe after a long use?
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Why bridges are declared unsafe after a long use?

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