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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ९

How does an object’s density determine whether the object will sink or float in water?

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प्रश्न

How does an object’s density determine whether the object will sink or float in water?

संक्षेप में उत्तर
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उत्तर

Whether an object will sink or float in a liquid is determined by the density of the object compared to the density of the liquid. If the density of a substance is less than the density of the liquid it will float. For example, a piece of wood which is less dense than water will float on it. Any substance having more density than water (for example, a stone), will sink into water.

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Principle of Floatation (Laws of Flotation)
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अध्याय 3: Fluids - Exercise [पृष्ठ ३७]

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सामाचीर कलवी Science [English] Class 9 TN Board
अध्याय 3 Fluids
Exercise | Q VI. 3. | पृष्ठ ३७

संबंधित प्रश्न

A body is held immersed in a liquid. (i) Name the two forces acting on the body and draw a diagram to show these forces. (ii) State how the magnitudes of two forces mentioned in part (i) determine whether the body will float or sink in liquid when it is released. (iii) What is the net force on the body if it (a) sinks and (b) floats? 


When a piece of wood is suspended from the hook of a spring balance, it reads 70 gf. The wood is now lowered into water. What reading do you expect on the scale of spring balance?


A body of weight W is floating in a liquid. Its apparent weight will be


A hollow metal cylinder of length 10 cm floats in alcohol of density 0.80 g cm-3, with 1 cm of its length above it. What length of cylinder will be above copper sulphate solution of density 1.25 g cm-3?


A test tube loaded with lead shots, weighs 150 gf and floats upto the mark X in water. The test tube is then made to float in alcohol. It is found that 27 gf of lead shots have to be removed, so as to float it to level X. Find R.D. of alcohol.


A cube of ice whose side is 4.0 cm is allowed to melt. The volume of water formed is found to be 58.24 cm3. Find the density of ice.


Explain the following:

Icebergs floating in the sea are very dangerous for ships.


Assertion: To float, body must displace liquid whose weight is equal to the actual weight.

Reason: The body will experience no net downward force in that case.


If you put one ice cube in a glass of water and another in a glass of alcohol, what would you observe? Explain your observations.


Where do we use lactometers?


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