Answer
Verified
425.1k+ views
Hint: The apparent weight of the body depends upon the weight of the surrounding fluid displaced by it. Objects having more volume will displace more volume. Objects having less density will occupy more volume compared to objects having more density and having the same mass.
Complete answer:
There are many factors that you need to take into consideration when you weigh something.
According to Archimedes' principle an object immersed in a fluid experiences a buoyant force which is equal to which is equal to the weight of the fluid displaced by it.
Thus,
Apparent weight = True weight – Weight of the displaced fluid ……… (i)
This buoyant force is nothing but the upthrust exerted due to fluid molecules. The direction of this buoyant force is opposite to the direction of gravitational force.
More the volume of an object, more it will displace the fluid, and thus more will be buoyant force acting on it.
Therefore, according to expression (i), if the amount of displaced fluid is more, its apparent weight will be less.
We can modify equation (i) as
True weight = Apparent weight + Weight of the displaced fluid ……… (ii)
In the question, it is given that a bag of cotton and an iron bar indicate a mass of 100kg when measured on a weighing machine. It means they both have the same apparent weight.
If we add this condition in equation (2), then we can conclude that an object displacing more fluid will have more weight in reality i.e. more true weight.
When we measure anything on a weighing machine, air is fluid present around it and that object will displace air depending upon its volume.
Density of an object is the ratio of its mass to volume.
i.e. \[\text{Density=}\dfrac{\text{Mass}}{\text{Volume}}\]
Therefore, density is inversely proportional to the volume. Hence more the mass, less will be its density and vice versa.
We know that cotton has less density compared to iron bars. Therefore, cotton will occupy more volume than an iron bar if both have the same weight.
Thus, as cotton has more volume compared to iron bars, it will displace more air surrounding it and hence, it will have more weight in reality.
Therefore, in reality, cotton is heavier than an iron bar in a given case.
Note:
Since apparent weight depends on the volume of fluid displaced by it, while weighing you should take care that objects in both weighing pans have comparable size. The surrounding temperature, pressure and humidity also affect the apparent weight. The weighing object should not be hot and wet.
Complete answer:
There are many factors that you need to take into consideration when you weigh something.
According to Archimedes' principle an object immersed in a fluid experiences a buoyant force which is equal to which is equal to the weight of the fluid displaced by it.
Thus,
Apparent weight = True weight – Weight of the displaced fluid ……… (i)
This buoyant force is nothing but the upthrust exerted due to fluid molecules. The direction of this buoyant force is opposite to the direction of gravitational force.
More the volume of an object, more it will displace the fluid, and thus more will be buoyant force acting on it.
Therefore, according to expression (i), if the amount of displaced fluid is more, its apparent weight will be less.
We can modify equation (i) as
True weight = Apparent weight + Weight of the displaced fluid ……… (ii)
In the question, it is given that a bag of cotton and an iron bar indicate a mass of 100kg when measured on a weighing machine. It means they both have the same apparent weight.
If we add this condition in equation (2), then we can conclude that an object displacing more fluid will have more weight in reality i.e. more true weight.
When we measure anything on a weighing machine, air is fluid present around it and that object will displace air depending upon its volume.
Density of an object is the ratio of its mass to volume.
i.e. \[\text{Density=}\dfrac{\text{Mass}}{\text{Volume}}\]
Therefore, density is inversely proportional to the volume. Hence more the mass, less will be its density and vice versa.
We know that cotton has less density compared to iron bars. Therefore, cotton will occupy more volume than an iron bar if both have the same weight.
Thus, as cotton has more volume compared to iron bars, it will displace more air surrounding it and hence, it will have more weight in reality.
Therefore, in reality, cotton is heavier than an iron bar in a given case.
Note:
Since apparent weight depends on the volume of fluid displaced by it, while weighing you should take care that objects in both weighing pans have comparable size. The surrounding temperature, pressure and humidity also affect the apparent weight. The weighing object should not be hot and wet.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Why Are Noble Gases NonReactive class 11 chemistry CBSE
Let X and Y be the sets of all positive divisors of class 11 maths CBSE
Let x and y be 2 real numbers which satisfy the equations class 11 maths CBSE
Let x 4log 2sqrt 9k 1 + 7 and y dfrac132log 2sqrt5 class 11 maths CBSE
Let x22ax+b20 and x22bx+a20 be two equations Then the class 11 maths CBSE
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
At which age domestication of animals started A Neolithic class 11 social science CBSE
Which are the Top 10 Largest Countries of the World?
Give 10 examples for herbs , shrubs , climbers , creepers
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
Write a letter to the principal requesting him to grant class 10 english CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Fill in the blanks A 1 lakh ten thousand B 1 million class 9 maths CBSE