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What is a vector quantity

Posted by Anurag Dubey 3 years, 4 months ago

5 answers

Anmol Preet 3 years, 4 months ago

1) They have both magnitude and direction. 2) This quantity must need specify the direction along with the magnitude. 3) Vectors cannot divide each other.

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Harsh Dubey 3 years, 4 months ago

The quantity which has magnitude as well as directio

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Shagunpreet Kaur 3 years, 4 months ago

A quantity that has both Magnitude and direction.

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Saleha Khan 3 years, 4 months ago

The quantity which has (numerical value) magnitude an direction both , is known as vector quantity.

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Anurag Dubey 3 years, 4 months ago

It is a physical quantity having both magnitude as well as direction example velocity displacement

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ANSWER

Convert the temperature to the Kelvin scale 25°C..

Posted by Khushi Choudhary 3 years, 4 months ago

CBSE > Class 09 > Science

4 answers

Saumya Rwt 3 years, 4 months ago

25° +273=298

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Priyanshi Maheshwari 3 years, 4 months ago

298k hottu

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₹! &#! _@ ?? 3 years, 4 months ago

Temperature in kelvin =temperature in 0 Celsius +273 so 25 degree Celsius equal to C (25+ 273)k =298k

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Anurag Dubey 3 years, 4 months ago

Temperature in kelvin =temperature in 0 Celsius +273 so 25 degree Celsius equal to C (25+ 273)k =298k

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ANSWER

What is the defination of pure substance

Posted by Krishna Thakur 3 years, 4 months ago

CBSE > Class 09 > Science

4 answers

₹! &#! _@ ?? 3 years, 4 months ago

A substance that has a fixed chemical composition throughout is called pure substance

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Anurag Dubey 3 years, 4 months ago

A substance that has a fixed chemical composition throughout is called pure substance

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Abhishek Garg 3 years, 4 months ago

The substance which are pure

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Akshiii ?? 3 years, 4 months ago

A substance that has a fixed chemical composition throughout is called pure substances such as water, air and nitrogen. A pure substance does not have to be of a single element or compound. ~ Hope it helps ?

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Lori moves 4m due east and 3m due west What is the distance covered by lori? What it is displacement?

Posted by Yashvi Shah 3 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Akash Ashwin Baa 3 years, 4 months ago

Distance = 7m / Displacement = 1m

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Akshiii ?? 3 years, 4 months ago

Distance = 7m \ Displacement=1m

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ANSWER

To draw a labelled diagram of a eukaryotic cell and write main function of mitochondria, Golgi apparatus, Lysosomes, plastids.

Posted by Ruby Jha 3 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Vivek Sharma 3 years, 4 months ago

Ktdptaizoa7 ft dp5dp7yiz dsc upyou datt dp souU ac ot

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To prepare a temporary mount of onion peel cell and study its structures.

Posted by Ruby Jha 3 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Akshiii ?? 3 years, 4 months ago

Go to the book seller (or burrow )and buy srijan publisher's (A Simple study of biology) in that book page no. 59 and 60.. both the activities are given onion peel also and... Human cheek cells also... Well here's the conclusions :- 1)In onion peel- Onion bulb is format of numerous cells. The cells are plant cells because of the presence of cell wall and large vacuole. 2)In human cheek cells- our body is formed of cells. The cells are animal cells as each cell has only a cell membrane and its outer boundary. Cell wall, central prominent vacuole and plastids are absent.

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A ball is dropped from the top of a building. The ball hits the ground in 6sec what is the height of the height of the building ? (from Physics)

Posted by Shahana Sreemathi 3 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Yogesh Singh 3 years, 4 months ago

180 m

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ANSWER

How to seperate gel colloid

Posted by Mitesh Doshi 3 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Akshiii ?? 3 years, 4 months ago

Particles of colloidal solution can be separated by centrifugation. The process employs the principle that particle that are dense settle at bottom whereas the lighter particles stay at the top when spun rapidly. ~ Hope it helps ?

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Onion peel and human check cell therory

Posted by Mohd Hasan Khan 3 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Akshiii ?? 3 years, 4 months ago

Go to the book seller (or borrow) srijan publisher's (A Simple study of biology) In that book page no. 59 and 60 are having both the activities (well explained). Well.. here's the conclusions for you:- 1) In onion peel cells- onion bulb is formed of numerous cells. The cells are plant cells because of the presence of cell wall and large vacuole. 2) In human cheek cells- our bodies is formed of cells. The cells are animal cell as each cell has only a cell membrane and its outer boundary. Cell wall , central prominent vacuole and plastids are absent. ~ Hope it helps ?

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The distance travelled by an auto rickshaw in 2 hours is 40km.Find out the Speed in km/hr and m/s

Posted by Rithika Dhanasekaran 3 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Gopal Sharma 3 years, 4 months ago

Speed distance/time Speed 40/2 20 km/hr

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Jayesh Shelar 3 years, 5 months ago

5.55 m / s 20 km / hr

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Arpit Airen 3 years, 5 months ago

{tex}Speed = {Distance \over time}{/tex}

{tex}Speed= {40 \over 2} = 20 km/hr{/tex}

{tex}1km/hr = {1000 \over 3600} m/sec = {5 \over 18} m/sec {/tex}

{tex}Speed = {20 * {5 \over 18}} m/sec =5.55 m/sec{/tex}

Answer

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Changing of state of matter

Posted by Vinit Patel 3 years, 5 months ago

CBSE > Class 09 > Science

4 answers

Riya Singh 3 years, 4 months ago

By changing the temperature

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Riti Mehta 3 years, 4 months ago

By changing temperature By changing pressure

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Shagunpreet Kaur 3 years, 4 months ago

By increasing or decreasing the temperature

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Jayesh Shelar 3 years, 5 months ago

Solid to liquid - melting Liquid to gas. - evaporation Solid to gas - sublimation Gas to liquuid. - condensatio Liquid to solid - freezing

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ANSWER

By changing the temperature

Posted by Vinit Patel 3 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Riya Singh 3 years, 4 months ago

Changes the state of matter

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Akshiii ?? 3 years, 4 months ago

Complete the Question

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Differentiate between solute and solvent

Posted by Vignesh V 3 years, 5 months ago

CBSE > Class 09 > Science

4 answers

Harshita Sarda 3 years, 3 months ago

SOLUTE:-it disolves in solvent. SOLVENT:-which dissolves solute.

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Riya Singh 3 years, 4 months ago

Solution is a which dissolve in something and solvent is a substance which dissolve the solute

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Mohd Hasan Khan 3 years, 4 months ago

Solute is a substence which dissolves in something . The solvent is substance which dissolves the solute

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Kishory S 3 years, 5 months ago

Solute is a substence which dissolves in something . The solvent is substance which dissolves the solute

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ANSWER

Put unlit incense stick in a corner of your class . How close do you have to go near it so as to get its smell?

Posted by Binit Jeeban Mohanty 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Girdhar Arora 3 years, 4 months ago

We have to go atleast 5cm near the unlit incense stick so that we can smell But if we light it then we can smell it without going closer as diffusion increases with increasing temperature .

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Container comment upon the following

Posted by Kritika Chaudhary 3 years, 5 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What are the states of matters?

Posted by Kamal Kumar Hajra 3 years, 5 months ago

CBSE > Class 09 > Science

5 answers

Sia ? 3 years, 5 months ago

There are three common states of matter:

Solids – relatively rigid, definite volume and shape. In a solid, the atoms and molecules are attached to each other.
Liquids – definite volume but able to change shape by flowing. In a liquid, the atoms and molecules are loosely bonded.
Gases – no definite volume or shape.

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Jayesh Shelar 3 years, 5 months ago

Solid liquid and gas more 2 are there plasma and bose Einstein

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Vignesh V 3 years, 5 months ago

The 3 states of matter are solid, liquid and gas. There are 2 more state of matter they are plasma and Bose Einstein condensate

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Suriya . J 3 years, 5 months ago

Solid Liquid Gas Plasma B.E condercants

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₹! &#! _@ ?? 3 years, 5 months ago

Solid liquid gaseous

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Write the chemical nature of plasma membrane or cell wall

Posted by Jaya Kothari 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 5 months ago

Cholesterol is also present in the plasma membrane. The cholesterol molecules are embedded in the interior of the membrane. They make the membrane less permeable for water-soluble substances. Cholesterol molecules make the membrane rigid structure.

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ANSWER

Tabular between solid liquod gass

Posted by Devil Gamers 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 5 months ago

Gases are primarily free-flowing, with little to no intermolecular force acting between them. It is important to know the major differences between solids, liquids and gases.

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ANSWER

Which of the three is travelling the fastest?

Posted by Premika Nepali 3 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Girdhar Arora 3 years, 4 months ago

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₹! &#! _@ ?? 3 years, 5 months ago

Question is not completed bhna

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Aman Kumar 3 years, 5 months ago

It looks that your questions is incomplete.

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ANSWER

how will you change water from gaseous state to liquid change ? suggest a simple activity

Posted by Azka Khan 3 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Sia ? 3 years, 5 months ago

Water can be changed from gaseous state to liquid state by condensation that is lowering down the temperature of water vapours. This can be done by very simple activity that you also observe in daily life. Take out chilled water bottle from refrigerator.

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Shagunpreet Kaur 3 years, 4 months ago

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benzene is liquid. at 80°c liquid benzene is in equilibrium with its vapours .it is found that particles of benzene vapours are more enetgetic than particles of liquid benzene exlplain the observation

Posted by Azka Khan 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 5 months ago

At 80°C, liquid benzene is in equilibrium with its vapors. Particles of benzene vapors are more energetic because of benzene vapours have gained extra energy in the form of latent heat of vaporisation. Hence it is more energetic.

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seema visited a natural gas compressing unit and found that the gas can be liquified under specific conditions of temperature and pressure . while sharing her experience with her friends she got confused . help her to remember the correct set of conditions.

Posted by Azka Khan 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Vignesh V 3 years, 5 months ago

Under high pressure (1 atm) and low temperature, gas can be converted into liquid

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why does a gas expert pressure on the walls of the container?

Posted by Azka Khan 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Vignesh V 3 years, 5 months ago

Because of high kinetic energy and negligible forces of attraction the particles of a gas move with high speeds in all directions. When the fast-moving gas particles hit the walls of the container from inside, they exert pressure. Thus the pressure exerted by gas is due to the constant collision of the fast-moving gas particles against the inner walls of the container.

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ANSWER

Difference between animal cell and plant cell and Prokaryotic and eukaryote

Posted by ₹! &#! _@ ?? 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 5 months ago

Eukaryotic cells are more complex and larger than prokaryotic cells. Animal and plant cells contain many organelles not found in prokaryotic cells. Prokaryotes have no true nucleus as the DNA is not contained within a membrane, but is coiled up in a region of the cytoplasm called the nucleoid.

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Why napthalene balls disapper with time without leaving some liquid

Posted by Jalaj Meena 3 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Sia ? 3 years, 5 months ago

Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid.

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Harshita Sarda 3 years, 4 months ago

This happens through the process of sublimation

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Vignesh V 3 years, 5 months ago

Napthalene balls disapper with time without leaving some liquid because they directly change state from solid to gas, this type of change of state directly from solid to gas without changing to liquid is called sublimation

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ANSWER

At what temperature in the Kelvin scale does water boil explain what happens when we supply heat energy to water till it changes its state what is this heat energy called?

Posted by Sneha Sundriyal 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 5 months ago

If we want to change the physical state of any matter we have to change temperature and pressure mainly for the substances.
As the temperature increases, the solid state changes to liquid state and liquid state changes to gaseous state. The heat energy that is supplied to water till it changes its state is called as latent heat.
Water boils at 100°C temperature that can be written as,
100 + 273.15 = 373.15 K

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What do you mean by 2m/s^2?

Posted by Palkjot Kaur 3 years, 5 months ago

CBSE > Class 09 > Science

4 answers

Tarunpreet Singh?? 3 years, 5 months ago

SI unit of acceleration is 2m/s².

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Rikhia Sarkar 3 years, 5 months ago

It is the acceleration of an moving body

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Aryan Singh 3 years, 5 months ago

It is the SI unit of accelaration

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Swarnima Dixit S.D 3 years, 5 months ago

Motion

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What will happen to plant cell if we will keep it in hypotonic solution

Posted by Ravinshu Goswami 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Lav Khator 3 years, 5 months ago

The cell will swell up due to endosmosis.

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What is Beyond the Matter??

Posted by Amit Raj 3 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Amit Raj 3 years, 5 months ago

Yes it's true that every matter is very far from each other but I mean there are more matters which are not senseable to human being but it can exist It can be invisibe and it can made with other basic particles just like Atoms ??

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Diksha Laniya🐥 3 years, 5 months ago

There are two answers to this question: 1. No, matter is not everywhere and, 2. I don't know. One of the amazing things that one learns in studying either Particle Physics (the study of REALLY small stuff) or Cosmology (the study of REALLY BIG stuff) is that you realize there is a lot of nothing in the universe. There is a lot of space that really has nothing in it. "Nothing" is sort of a tough and often confusing concept for our little human brains to comprehend. Relative to the size of things in our universe, the space between the things is huge. People are confused because so many popular images and even school science text books often show planets or stars near enough to each other that you can see several at the same time. Other than the moon and the sun, everything else in our universe is so far away that they appear as just points to our naked eyes.

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a boy walks 4 km/hr how much time will he take to travel 2000m

Posted by Utkarsh Dhote 3 years, 5 months ago

CBSE > Class 09 > Science