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CBSE Class 8 Answered

Describe Otto von Guericke experiment  
Asked by hmhomkar | 26 Jun, 2018, 05:04: PM
answered-by-expert Expert Answer
A German scientist, Otto Von Guericke placed two hollow metal hemispheres together. Then almost all the air from the combined hemispheres was removed using vacuum pump. The teams of horses were attached at both the ends of hemispheres. These hemispheres were then tried to pull apart from each other by the force of horses. But the air pressure on outside of combined hemispheres were much greater than the air pressure inside them. Thus the hemispheres were unable to seperate from each other.  In this way, he demonstrated the experiment of air pressure. 
Answered by Shiwani Sawant | 27 Jun, 2018, 11:13: AM

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CBSE 8 - Science
what is pressure
Asked by sitadeepak3 | 19 Aug, 2023, 08:00: PM
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CBSE 8 - Science
We say that pressure is defined as the amount of force exerted on an unit area and if the area is decreased, pressure increases For example an iron nail would be applying more pressure than any other thing let's say 100 N per m square but the question is an iron nail doesn't cover an area of m square so why do we say 100 N per m square
Asked by aejazahmadlone36 | 28 Dec, 2022, 10:10: PM
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CBSE 8 - Science
If the force applied on an area of 40 cm²  is 2N what is the pressure ?
Asked by Omwatisahu09 | 28 Oct, 2022, 11:34: AM
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CBSE 8 - Science
force acting on an area of 100 cm² is 200N find the pressure acting on this area in N/m²
Asked by dewoolkarrohit | 03 Jun, 2022, 02:27: PM
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CBSE 8 - Science
The pressure of the inflated balloon is less or greater than the atmospheric pressure? Why? Explain.
Asked by JDishere19 | 29 Nov, 2021, 08:42: PM
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CBSE 8 - Science
what is pressure
Asked by angelascott7pis | 12 Nov, 2021, 10:27: PM
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CBSE 8 - Science
A car has a weight of 8000N. The car is supported by 4 tyres.  The weight on each tyre is equal. The area of one tyre in contact with the ground is 150 cm2 . Calculate the pressure that one tyre exerts on the ground.  Show your working and give your answer in N/cm2 .
Asked by kavitagangar540 | 30 Sep, 2021, 11:40: PM
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CBSE 8 - Science
4. You are given the following masses and volumes for various blocks of materials. The mass of 1cm^ 3 of water  is 1g.From them choose which one will float in water? (A)materialW:mass=12g,volume=10cm 3 (B)materialY:mass=30g,volume=28cm 3 (C)materialX:mass=22g,volume=20cm3 (D)materialZ;mass=12g,volume=13cm3
Asked by shammiaryan2 | 28 Sep, 2021, 10:45: AM
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CBSE 8 - Science
what does pressure depend on?
Asked by sadiyaarebiyani58.8dgatl | 16 Aug, 2021, 09:01: PM
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CBSE 8 - Science
5 applications on atmospheric pressure
Asked by anirban.dutta527 | 19 Jun, 2020, 01:36: AM
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