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CBSE Class 9 Answered

What is the mass & density of the nucleus in an atom?
Asked by reenabhartintpc001 | 12 Mar, 2018, 07:35: PM
answered-by-expert Expert Answer
Let mass number of nucleus A and atomic number is Z. Hence it has Z number of protons and (A-Z) number of nuetrons.
mass of nucleus = Z×mass of protons +(A-Z)×mass of neutrons; 
(actually mass of nucleus is slightly less than the value calculated as above due to packing fraction. But we will neglect this small difference)
density of nucleus = mass of nucleus / volume of nucleus
Answered by Thiyagarajan K | 13 Mar, 2018, 11:44: AM

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CBSE 9 - Physics
An object of mass 1kg is falling from the height h=10m.calculate a) the total energy of an object at h=10m b) potential energy of the object when it is at h=4m c) kinetic energy of the object when it is at h=4m d) what will be the speed of the object when it hits the ground
Asked by mailtoparvathyprajith | 08 Feb, 2024, 06:45: PM
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CBSE 9 - Physics
1)state energy conversion takes place in hydroelectric power plants? 2)an object of mass 1kg is falling from a height of 10 m. Calculate i) the total energy of object at h=10m ii) Potential energy of an object when h=4m   3)Name energy transfers which occurs when a)an electri bell rings b)someone speake into a microphone c)there is a picture on television screen d)A torch is on  
Asked by mailtoparvathyprajith | 08 Feb, 2024, 12:32: PM
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CBSE 9 - Physics
Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?
Asked by mailtoparvathyprajith | 08 Feb, 2024, 12:13: PM
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CBSE 9 - Physics
The average speed of a moving body can never be zero but the average velocity of a moving body can be zero. Justify.
Asked by mailtoparvathyprajith | 06 Feb, 2024, 09:50: PM
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CBSE 9 - Physics
  Arrange the following speeds in increasing order(keeping the least speed first): (i) An athlete running with a speed of 10m/s. (ii) An bicycle moving with a speed of 200m/min. (iii) An scooter moving with a speed of 30km/h
Asked by mailtoparvathyprajith | 06 Feb, 2024, 09:10: PM
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CBSE 9 - Physics
3)A body does 20 joules of work in 5 seconds what is power
Asked by mailtoparvathyprajith | 06 Feb, 2024, 09:00: PM
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CBSE 9 - Physics
when an arrow is shot from its bow it has kinetic Energy. From where does it get the kinetic Energy
Asked by mailtoparvathyprajith | 06 Feb, 2024, 08:44: PM
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CBSE 9 - Physics
If person A reaches the 2nd floor Of a shopping mall by lift and Person B reaches the same floor by stairs and both their masses are same. Is work done by person B is greater than Person A  against gravitational force.Justify your answer
Asked by mailtoparvathyprajith | 06 Feb, 2024, 08:24: PM
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CBSE 9 - Physics
calculate the amount of work required to stop a car of 1000kg moving with speed of 72km/h
Asked by sadhanaasadhanaa67 | 04 Feb, 2024, 12:27: PM
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CBSE 9 - Physics
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Asked by mailtoparvathyprajith | 31 Jan, 2024, 06:55: PM
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