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question_answer1) Give two examples each of situations in which you push or pull to change the state of motion of objects.
question_answer2) Give two examples of situations in which applied force causes a change in the shape of an object.
question_answer3) Fill in the blanks in the following statements. (a) To draw water from a well we have to _____ at the rope. (b) A charged body _____ an uncharged body towards it. (c) To move a loaded trolley we have to ______ it. (d) The north pole of a magnet the north pole of another magnet.
question_answer4) An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms, muscular, contact, non-contact, gravity, friction, shape, attraction (a) To stretch the bow, the archer applies a force that causes a change in its ____. (b) The force applied by the archer to stretch the bow is an example of_____ force. (c) The type of force responsible for a change in the state of motion of the arrow is an example of a _____force. (d) While the arrow moves towards its target, the forces acting on it are due to _____ and that due to _____ of air.
question_answer5) An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms, muscular, contact, non-contact, gravity, friction, shape, attraction (a) To stretch the bow, the archer applies a force that causes a change in its ____. (b) The force applied by the archer to stretch the bow is an example of_____ force. (c) The type of force responsible for a change in the state of motion of the arrow is an example of a _____ force. (d) While the arrow moves towards its target, the forces acting on it are due to _____ and that due to _____ of air.
question_answer6) A blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron?
question_answer7) An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?
question_answer8) Name the forces acting on a plastic bucket containing water held above ground level in your hand. Discuss why the forces acting on the bucket do not bring a change in its state of motion.
question_answer9) A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.
question_answer10) What is the magnitude of force if a pressure of 25,000 Pa acts on a surface area of\[0.50c{{m}^{2}}\]?
question_answer11) What will be the pressure in S.I system, when a force of 100 dynes acts on an area of\[0.02c{{m}^{2}}\]?
question_answer12) A cubical block of mass 2 kg with each side of 2cm is lying on the ground. What will be the pressure exerted by the block on the ground? (Take g \[=9.8\text{ }m/{{s}^{2}}\]).
question_answer13) The pressure exerted by the weight of a cubical block of a side 3 cm on the surfaces 5 Pa. What will be the weight (or force) of the block?
question_answer14) A drawing pin is pushed against a wooden table with a force of 10 N. Calculate the pressure exerted by the pin at a point on the table, if area of the point is \[0.01\text{ }c{{m}^{2}}\]
question_answer15) A person weighs 60 kg. The area under the foot of the person is \[\text{180 }c{{m}^{2}}\]. Find the pressure exerted on the ground by the person. (Take g \[=9.8\text{ }m/{{s}^{2}}\]).
question_answer16) A force of 500 N acts on the bullet of area of cross-section \[0.5\text{ }c{{m}^{2}}\]. What is the pressure on bullet in S.I system?
question_answer17) Force exerted by a truck is 500000 N and the pressure on the ground is 2500000 Pa. Calculate the area of contact of tyres with ground?
question_answer18) At a given place a barometer records a pressure of 70 cm of mercury. If the mercury in the barometer is replaced by water, what would be the height of the water column? Take density of mercury \[=1360kg/{{m}^{3}}\], density of water \[=1000\text{ }kg\text{ }/{{m}^{3}}\]
question_answer19) An oil barometer of greater is height than a water barometer. True of false.
question_answer20) Explain what happens when a hole is made in the top portion of the inverted tube of a barometer.
question_answer21) What will be the height of mercury column in a barometer, it it is taken to the moon?
question_answer22) The column of mercury in a barometer is 76 cm Hg. Calculate the atmospheric pressure if the density of mercury \[=\text{ }13600\text{ }kgn{{r}^{3}}\]. (Take \[g=10\text{ }m{{s}^{-2}}\])
question_answer23) If the mercury in the barometer is replaced by water, what will be the resulting height of the water column? Density of water \[=1000\text{ }kgn{{r}^{3}}\]density of mercury \[=13600\text{ }kgn{{r}^{3}}\]
question_answer24) Calculate the total pressure at the bottom of a lake of depth 5.1 m (atm. Pressure \[={{10}^{5}}\text{ }P\]), density of water \[={{10}^{3}}kg/{{m}^{g}}=10m/{{s}^{2}}\].
question_answer25) At a given place a barometer records a pressure of 70 cm of mercury. If the mercury in the barometer is replaced by water, what would be the height of the water column? Take density of mercury \[=13600\text{ }kg/{{m}^{3}}\], density of water \[=1000kg\text{ }/{{m}^{3}}\]
question_answer26) (a) The force exerted by atmospheric pressure on\[1{{m}^{2}}\]area of the earth's surface is approximately equal to the weight of two elephants. (b) We are carrying an eternal load of 18 adults on our head. Substantiate the two statements made above.
question_answer27) Two million molecules per square inch beat against a window pane every second. This force is sufficient to power a steam engine or a turbojet. Such enormous force should shatter the glass into pieces. But this does not happen. Why?
question_answer28) Our body is accustomed to high atmospheric pressure on ground. If we encounter, a low atmospheric pressure as is the case on high altitude we will experience the bursting of body cells, bleeding of nose and a high blood pressure. But in space, where astronauts dare to travel, atmospheric pressure does not exist at all. How do they cope with such condition?
question_answer29) On mountain tops, we breathe more and our ears tend to pop. Why?
question_answer30) Name the best suited liquid to use in a barometer.
question_answer31) At higher altitudes the passengers encounter dangers like bursting of body cells, bleeding of noses. Give reasons.
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