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Why do not we feel uneasy even under enormous pressure of the atmosphere above as?
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How is the reading of a barometer affected when it is taken to: A mine
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How is the reading of a barometer affected when it is taken to: A hill
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A solid weighs 2.10 N in air. It has a relative density of 8.4. How much will the body weigh if placed: In water
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A solid weighs 2.10 N in air. It has a relative density of 8.4. How much will the body weigh if placed: In a liquid of relative density 1.2
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Name an instrument based on this principle. State two uses of the instrument that you describe.
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State the principle of floatation. What can you say about the average density of a ship floating on water?
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Explain the following:
An egg sinks in fresh water but floats in a strong solution of salt.
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Explain the following:
A hydrometer is made heavy near the bottom.
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Explain the following:
Icebergs floating in the sea are very dangerous for ships.
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Draw a simple diagram of a Fortin's barometer and state how it is used to measure the atmospheric pressure.
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Describe an experiment to demonstrate that air exerts pressure.
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What is an aneroid barometer?
Draw a neat and labeled diagram to explain its construction and working.
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When a shot is fired from a gun, the gun is recoiled. Explain.
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A boy pushes a wall with a force of 10 N towards east. What force is exerted by the wall on the boy?
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In the Figure a block of weight 15 N is hanging from a rigid support by a string. What force is exerted by (a) a block on the string and (b) a string on the block? Name and show them in the diagram.
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What do you understand by the term force due to gravity ?
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Explain the meaning of the following statement '1 kgf = 9.8 N'.
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