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Name the physical quantity which equals the rate of change of linear momentum.
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State Newton's second law of motion. Is Newton's first law of motion contained in Newton's second law of motion?
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What do you mean by an impulsive force?
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State Newton's second law of motion.
A body of mass 400 g is resting on a frictionless table. Find the acceleration of the body when acted upon by a force of 0.02 N.
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What do you mean by linear momentum of a body? A force causes an acceleration of 10 ms-2 in a body of mass 1 kg. What acceleration will be caused by the same force in a body of mass 4 kg?
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Use Newton's second law to explain the following:
We always prefer to land on sand instead of hard floor while taking a high jump.
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Use Newton's second law to explain the following:
While catching a fast moving ball, we always pull our hands backwards.
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A stone is dropped from a cliff 98 m high.
How long will it take to fall to the foot of the cliff?
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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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