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A stone is dropped from a cliff 98 m high.
What will be its speed when it strikes the ground?
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A stone is thrown vertically upward with a velocity of 9.8 m/s. When will it reach the ground?
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A ball is thrown vertically downward with an initial velocity of 10 m/s. What is its speed 1 s later and 2 s later?
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A ball is thrown upward and reaches a maximum height of 19.6 m. Find its initial speed?
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A stone is dropped from a tower 98 m high. With what speed should a second stone be thrown 1 s later so that both hit the ground at the same time?
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What do you mean by the conservation of momentum? Briefly, explain the collision between two bodies and the conservation of momentum.
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How does the pressure at a certain depth in sea water differ from that at the same depth in river water? Explain your answer.
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What do you understand by atmospheric pressure?
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Write the numerical value of the atmospheric pressure on the surface of earth in pascal.
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What physical quantity is measured in torr? How is it related to the S.I. unit of the quantity?
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Name the physical quantity which is expressed in the unit 'atm'. State its value in pascal.
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We do not feel uneasy even under enormous pressure of the atmosphere above as well as around us. Give a reason.
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Describe an experiment to demonstrate that air exerts pressure.
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Explain the following :
A balloon collapses when air is removed from it.
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Explain the following :
Water does not run out of a dropper unless its rubber bulb is pressed .
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Explain the following :
Two holes are made in a completely filled sealed tin can to take out oil from it .
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Why does the liquid rise in a syringe when its piston is pulled up?
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How is water drawn up from a well by a water pump?
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A partially inflated balloon is placed inside a bell jar connected to a vacuum pump. On creating vacuum inside the bell jar, balloon gets more inflated. How does the pressure change: increase, decrease or remains same, inside the (a) bell jar, (b) balloon?
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What is the purpose of a barometer?
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