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

molecular mass or molecular weight is the mass of a molecule. It is calculated as the sum of the relative atomic masses of each constituent element multiplied by the number of atoms of that element in the molecular formula

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Why economic status is related to our individuals health

Posted by Rachna Rajbhar 7 years, 3 months ago

CBSE > Class 09 > Science

0 answers

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What is electrode?

Posted by Sanya Shourya 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Abhinav Soni 7 years, 3 months ago

electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit

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what is SONAR..

Posted by Akash Omar 7 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Akshay Arun Thorat 7 years, 3 months ago

It is used to detect in seas the location of enemy submarine by transmiter

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Akshay Arun Thorat 7 years, 3 months ago

Full form of SONAR is sound navigation and ranging

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Krish Sharma 7 years, 3 months ago

Sonar is a technique that uses sound propagation to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.

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Write the four characteristics based on which the organisms are classified into five Kingdoms

Posted by Ay K 7 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Shreya Thakur 7 years, 3 months ago

No the characters are following 1.No of cells they are made of (unicellular/multicellular) 2.Mode of nutrition (heterotrophic/autotrophic) 3.Their cell wall (eukaryotic/prokaryotic)

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Sahil Kumar 7 years, 3 months ago

Division Class Family Genus Species

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If we want to convert water vapour in to liquid

Posted by Digvijay Gohil 7 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Amrita Tiwary 7 years, 3 months ago

Condensation

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Abhinav Soni 7 years, 3 months ago

Condensation is the change of water from its gaseous form (water vapor) into liquid water.

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Priya Gaur 7 years, 3 months ago

Maybe condensation

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Het Patel 7 years, 3 months ago

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A stone of mass 150kg rolls down a hill which is 700m height in 1 minute 30s.find power of this stone.

Posted by Harsha Ganian 7 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Amrita Tiwary 7 years, 3 months ago

Sorry! W/t that means. P= m×g× h/time in second

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Amrita Tiwary 7 years, 3 months ago

P=w×t P=m×g×t in second

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Het Patel 7 years, 3 months ago

See, m=150 kg h=700 m t=60×30 sec=1800sec So p=w/t But w us missing So, Force= mass × acceleration =150×10 =1500 N So W=f×s =1500×700 =1050000 J Therefore, P=1050000÷1800 =583.333333....... Ok. Pls like this if this answer is write

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Aditi Jain 7 years, 3 months ago

Power- w/t

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State the factors on which buoyant force depend

Posted by Deepak Kumar 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 3 months ago

As we know, buoyant force = weight of the fluid displaced by immersed part of body = rng. But, rn= volume of fluid displaced x density of fluid = ye
Buoyant force = Veg
Thus, buoyant force depends directly upon:
(i) Volume of the fluid displaced.
(ii) Density of the fluid in which the body is immersed.
(iii) Acceleration due to gravity at the place.

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How carbon dioxide help to envirnment

Posted by Nithesh Nimesh 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 3 months ago

Carbon dioxide is fixed in environment in two ways

(i) By the process of photosynthesis in plants.
(ii) It get dissolve in water in the form of bicarbonates which gives rise to carbonate rocks.

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The place where they live in is not the basis of classification. Comment.

Posted by Shobika Ramalinham 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Shreya Thakur 7 years, 3 months ago

Yes you are true because various types of varied organisms live at a single place

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What are the prevention for disease

Posted by Deepak Kumar 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Priya Gaur 7 years, 3 months ago

Public hygiene For air born disease prevent exposure to overcrowded place Water born prevent exposure to contaminated water

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Difference between life on the moon and life on mars

Posted by Komal Goyal 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Aditi Jain 7 years, 3 months ago

Their in t.b

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Pet

Posted by Adarsh Singh 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Adarsh Singh 7 years, 3 months ago

Pagal

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You know full form of IUPAC

Posted by Aanchal Jaiswal 7 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Shreya Thakur 7 years, 3 months ago

International Union of Pure and Applied Chemistry

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Arya Magade 7 years, 3 months ago

International Union of Applied Chemistry

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Aanchal Jaiswal 7 years, 3 months ago

Ya right tnx Gaurav

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Gaurav Seth 7 years, 3 months ago

A chemical nomenclature is a set of rules to generate systematic names for chemical compounds. The nomenclature used most frequently worldwide is the one created and developed by the International Union of Pure and Applied Chemistry (IUPAC).

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how was the problem of what to do with bruno finally solved

Posted by Sangita Ankita 7 years, 3 months ago

CBSE > Class 09 > Science

0 answers

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Expression for potential energy

Posted by Jasmeet Singh 7 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Karan Singh 7 years, 3 months ago

If we raise a body of mass"m"to a height "h" and during this a force of acceleration due to gravity is acting in opposite direction of the motion of the body.. Now we know that work done=force*distance........(1) And we also know that face=Mass*acceleration =m*g...........(2) And here perpendicular distance=h..........…..............,....(3) From (1) ,(2) and (3): Work done=force*distance =m*g*h And we also know that work done=energy consumed or energy used up. And we also know that energy consumed by a body=energy gained by another body. ,(if work is done by first body on another second body) Therefore, energy=m*g*h.. Here the body is raised therefore here energy will be gravitational potential energy... So. Potential energy=m*g*h Note: g=acceleration due to gravity . While G=gravitational constant

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Mehul Patel 7 years, 3 months ago

M×G×H Where M=mass G=gravitation force H=height

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What is the relation between g and G?

Posted by Lakshyant Verma 5 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Aanchal Jaiswal 7 years, 3 months ago

Newton 2nd F=MA (a=g) F=MG....1 U. L.g. F= GMm r2.... 2 Equation (1) and (2) Mg = GMm r2 g= GM r2

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What means law of constant proportional

Posted by Suraj Maurya 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

A R 7 years, 3 months ago

any chemical compound is made up of same type of element which are combined together by mass

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who was newton

Posted by Suraj Maurya 7 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Prince Kumar 7 years, 3 months ago

Isaac Newton was a scientist and he gives law of motion

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Shreya Thakur 7 years, 3 months ago

No father of physics is Sir Isaac Newton

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Shweta Lodhi 7 years, 3 months ago

No father of physics is Einstein not newton

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Lakshya Sharma Lucky 7 years, 3 months ago

Father of physics

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Is hemichordate is also known as protochitdate

Posted by Palak Gupta 7 years, 3 months ago

CBSE > Class 09 > Science

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Derive the equation F=GM×m/r×r

Posted by Satish Patel 7 years, 3 months ago

CBSE > Class 09 > Science

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Why sound needs material medium to travel.Why it cant propogate without a material medium as light does.

Posted by Mehak Sharma 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Palak ?? 7 years, 3 months ago

As sound is produced due to vibrations...and vibrations take place within the particles...and particles lie within a medium... So is there will be no medium so there will be no particle and if there will be no particles there will be no vibrations and if there will be no vibrations no sound will be produced therefore sound needs a medium to travel whereas light is independent to travel without particles so I do not need any medium to propagate....

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Why are lysosomes are called suciede bag

Posted by Vinit Tripathi 7 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Aanchal Jaiswal 7 years, 3 months ago

Lysosome also known as the suicidal bags of the cell because they can digest or kill the cell these cell organelles have digestive enzymes.

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Neha Kachave 7 years, 3 months ago

When the cells damaged,lysosomes may burst and the enzymes digest their own cell therefore, lysosomes are also known as the 'suicide bags' of a cell

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Abhinav Soni 7 years, 3 months ago

lysosomes bursts releasing. those digestive enzymes. the released enzymes then digest their own cell and ultimately. the cell dies hence lysosomes are called suicide bags of the cell

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What is an activity to show law of conservation of mass???

Posted by Arya Yadav 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Palak ?? 7 years, 3 months ago

Just show the reaction given in the first question of the very first blue one questions that reaction completely describes conservation of mass

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How can we separate drug from blood. Explain the whole process

Posted by Akarsh Tripathi 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Abhinav Soni 7 years, 3 months ago

By the help of chromatography we can separate drugs from blood. Chromatography is a technique used to separate components in a mixture on the same solvent. Example :- others colours from blue or black ink

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What is Phallogeny?

Posted by Avishek Vishwakarma 7 years, 3 months ago

CBSE > Class 09 > Science