CBSE > Class 09 > Science | CBSE Board | Homework Help

The finest particle in a substance is called as atom. The group of atoms combines to form a molecule. Eg: Na(sodium atom), Cl(chlorine atom) these two atoms combines in the ratio of 1:1 to form the molecule NaCl(sodium chloride)

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What is solution and kinds of solution

Posted by Shubham Kumar 4 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Chaithanya Kumar 8Th Class 4 years, 3 months ago

The homogeneous mixture of two substances is called solution. There are two components in a solution called solvent and solute

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Siddhi Kochhar 4 years, 3 months ago

A solution can be categorized into several components. ... In solid solutions, solute and solvent are in the solid-state. For example ceramics and polymer blends. In liquid solutions, solid, gas or liquid is mixed in a liquid state. Gaseous solutions are usually homogenous mixtures of gases like air. There are three types of solutions that can occur in your body based on solute concentration: isotonic, hypotonic, and hypertonic.

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To balls A and B of masses m and m2 in motion with velocity 2v and v respectively compare there inertia . There momentum and compare the force needed to stop them in given time

Posted by Ashish Saini 4 years, 3 months ago

CBSE > Class 09 > Science

0 answers

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Explain , why some of the leaves may get detached from a tree , if we vigorously shake it's branch ?

Posted by Rohini Prajapati ..... 🤪 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Chaithanya Kumar 8Th Class 4 years, 3 months ago

Due to the inertia of rest ie: when we shake the tree then the leaves tries to stay in their position so the tree will move and the leaf will falls

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A scooter is moving with a inital velocity of 90km per hour and take 10 second to stop it after the brakes are applied calculate the force acerted by the brakes of the scooter of its mass along with rider is to 100kg what would be the force if mass is half

Posted by Ashish Saini 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Shubham Sharma 4 years, 3 months ago

u=90×5÷18 t=10s deacceleration(a)=? a=v-u÷t a=0-25÷10 a=2.5m/sec^2

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A bullet of mass =10g moving with a velocity of embedded in a freely suspended wooden clock of 900g. What is the velocity accured by block

Posted by Ashish Saini 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Chaithanya Kumar 8Th Class 4 years, 3 months ago

Incomplete question

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What is the syllabus of physics

Posted by Raman Pandey 4 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Bhavna Sharma 4 years, 3 months ago

Yes same answer

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Sudha Kumari 4 years, 3 months ago

In term 1 Ch :1 motion Ch:-2 force and law of motion And In Term:-2 Ch:- 3 gravitation by leaving flotation part Ch:-4 work and energy

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Give me Hard and tricks questions for matter in our surroundings at least 5

Posted by Mayank Srivastava 4 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Shrishti Rathore 4 years, 3 months ago

Definition of sublimation

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Pra Jit 4 years, 3 months ago

I know the answer for both kushi K patel ,andchathanya Kumar ?? but I should not tell the answer so I ask a question what is the boiling point of water at sea level?

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Chaithanya Kumar 8Th Class 4 years, 3 months ago

Explain kinetic theory of gases State the properties of bose einstein condensate What is the glowing material in tube light and how the stars glow?

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Khushi K Patel 4 years, 3 months ago

Name one property which is show by naphthalene and not by sodium chloride.

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Rays of sun are : Solid , Liquid , or Gas .

Posted by Rohini Prajapati ..... 🤪 4 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Shubham Sharma 4 years, 3 months ago

Solid

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Bhavna Sharma 4 years, 3 months ago

Gas

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Chaithanya Kumar 8Th Class 4 years, 3 months ago

Light is made up of very tiny energy pockets called photons which are solid in nature hence the light is solid in nature

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Khushi K Patel 4 years, 3 months ago

Gas

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We move towards one side when we go along a hair pin bend .Give reason?

Posted by Vishal V 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Jashanpreet Kaur Jashanpreet Kaur 4 years, 3 months ago

Matter around is pure

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How do substances like Co2 water move in and out of the cell?

Posted by Likhith Kannadiga 4 years, 4 months ago

CBSE > Class 09 > Science

5 answers

Chaithanya Kumar 8Th Class 4 years, 3 months ago

Its ok

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Pra Jit 4 years, 3 months ago

By diffusion process

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Khushi K Patel 4 years, 3 months ago

Diffusion

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Likhith Kannadiga 4 years, 4 months ago

Thanks Chaitanya

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Chaithanya Kumar 8Th Class 4 years, 4 months ago

Due to the process called diffusion

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Isotopes defination

Posted by Wansaka Suchiang 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Avinesh Kumar Shyam 4 years, 4 months ago

Isotopes one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearby identical chemical behaviour but with different atomic masses and physical properties every chemical element has one or more isotopes

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Two objects each of mass 1.5 kg are moving along the same straight line. Velocity of each object is 2.5 m/s before the collision during which they stick together. What will be the velocity of combined objects after collision?

Posted by Shubham Khanna 4 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Shrishti Rathore 4 years, 3 months ago

V=0

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V.V. Rajavardhan 4 years, 4 months ago

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Find the recoil velocity of a gun having mass equal to 5 kg, if a bullet of 25gm acquires the velocity of 500m/s after firing from the gun.

Posted by Shubham Khanna 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Chaithanya Kumar 8Th Class 4 years, 4 months ago

2.5 m/s

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Two balls A and B of masses 'm' and '2 m' are in motion with velocities '2 v' and 'v' respectively. Compare (i) their inertia (ii) their momentum and (iii) the force needed to stop them in the same time.

Posted by Shubham Khanna 4 years, 4 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

A car of mass 200 kg moving at 36 km/h is brought to rest after it covered a distance of 10 m. Find the retarding force acting on the car.

Posted by Shubham Khanna 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Chaithanya Kumar 8Th Class 4 years, 4 months ago

1000 newtons (I cant explain them properly)

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What is the nature of the distance-time graphs for uniform and non-uniform motion of an object

Posted by Neichülie Kense 4 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Pra Jit 4 years, 3 months ago

The nature distance time graph for uniform motion is a slope ( /) line AND whereas in non uniform motion won't be a slope.

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Ankit Kumar 4 years, 3 months ago

The nature of the distance time graph for uniform motion is straight line. The nature of the distance time graph for non uniform motion is curved line.

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A bus stating from rest moves with a uniform acceleration of 0.1m s_2 for 2 minute. Find (a) the speed acquired , (b ) the distance travel

Posted by Anshika Abha 4 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Naitik Rastogi 4 years, 3 months ago

720

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Rudra Singh 4 years, 4 months ago

A bus starting from rest - (u =0) Acceleration (a)- 0.1m/s² Time (t)- 2 minutes =120second Distance travel (s)=? Then, s=ut+½at² s=0×120+½×0.1×(120)² s=½×0.1×14400 s=½×1440 s=720m (b traveled)

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Features of squamous epithelium and columnar epithelium

Posted by Srinithi N W .H Vijayarajan 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Trisha Verma 4 years, 4 months ago

Squamous epithelium : 1. Protection 2. Exchange of gases Columnar epithelial : Helps in absorption

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Define Aves

Posted by Vaishnavi Mishra 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Official Harshit 4 years, 4 months ago

Answer Of Your Question In Biology Is The class of vertebrata that includes the birds.

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Give three examples of the range of variations that you see in life forms around you .

Posted by Rohini Prajapati ..... 🤪 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Chandra Bhushan Kumar Kumar 4 years, 4 months ago

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an object is freely falls from a certain height is 6000 m. if the final velocity of the particular object time t=60 is 300 m/s find the time taken by the object to from on the graph.

Posted by Aryan Gupta 4 years, 4 months ago

CBSE > Class 09 > Science

4 answers

Chaithanya Kumar 8Th Class 4 years, 3 months ago

Question is incomplete

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Rudra Singh 4 years, 4 months ago

Height(s)=6000 m Final velocity(v)=300m/s Time(t)=d/s Then, Time(t)=6000/300 t=20sec

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Aryan Gupta 4 years, 4 months ago

With explanation give answer

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Aryan Gupta 4 years, 4 months ago

Any body please give answer fast class 9

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Prove that S=at + 1/2at^2

Posted by N H 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Antusha Biswad 4 years, 4 months ago

(First draw the diagram. Here the link to it below) https://pin.it/1fSSKZa AO= u (initial velocity) BC= v (finial velocity) CO= t (time) BD= BC-DC = v-u S= area under the graph (which is the trapezium AOCB or the Rectangle AOCD + ∆ABD) (Area of rectangle is L x B and area of triangle is 1/2 x base x height) S= area of rectangle AOCD + area of ∆ABD S= OA x OC + 1/2 x t x v-u S= u x t + 1/2 x t x (v-u) (From equation 1- v=u + at v-u=at) Put the value of (v-u) from equation 1. S= ut+1/2 x t x at S= ut+1/2 x at² S=ut + 1/2 at² Hence, proved

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What would happen if the plasma membrane ruptures or break down?

Posted by Adarsh Kumar 4 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Pra Jit 4 years, 4 months ago

If the plasma membrane reptures or breaks down then molecules outside the cell can easily pass in and out also the cell organelles will move out of the cell and the cell will be destroyed.

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Rohini Prajapati ..... 🤪 4 years, 4 months ago

If the plasma membrane ruptures or break down the cell will not be able to exchange material from its surrounding by diffusion or osmosis.

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What is reason behind opening and closing of stomata?

Posted by Qwerty.. ...... 4 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Chaithanya Kumar 8Th Class 4 years, 3 months ago

The reason of opening and closing of stomata is for transpiration and exchange of gases

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Aysha Meer 4 years, 4 months ago

Dftgggg

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1) Differentiate between Eukaryotic and prokaryotic cells? 2) Differentiate between Animal cell and plant cell?

Posted by Abhaynoor Singh Pannu 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Piyush Technical World 4 years, 4 months ago

Comparing prokaryotes and eukaryotes The primary distinction between these two types of organisms is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not. ... In prokaryotes, DNA is bundled together in the nucleoid region, but it is not stored within a membrane-bound nucleus.

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