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

a) buoyancy is when an object I'd immersed in any any fluid it experiences an upthrust called buoyancy. b) frequency is how often a wave occurs (also pitch) c) the time interval of a wave to cross a fixed point d) amplitude is how high the wave goes or the loudness

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Define beyond force

Posted by Geetanjali Sonboir 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Abhyanand 7 years, 1 month ago

Force is exerted by the water on the object perpendicularly is called beyoncy force.

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What is big bang theore

Posted by Aalok Ranjan 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Asp Mcc 7 years, 1 month ago

Dal lai

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Anonymous Nameless 7 years, 1 month ago

it is a universal theory stated bt Stephen Hawkings and it's also a show on zee cafe.

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Why water??? is produce when we sprinkle salt on cucumber and onion

Posted by Ayush Ayush 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

If we sprinkle salt on cucumber slices, it releases water after some time due to the process of osmosis. Osmosis is a process where solute or salt from higher concentration moves towards lower concentration through a semi-permeable membrane. Here in this case, salt concentration is more outside on the cucumber slices. The individual cell membrane of cells present in cucumber slices act as semi-permeable membrane. Inside the cucumber cells there is less concentration of salt or solute and more concentration of water. Therefore, the salt from outside goes inside individual cells and the water comes out as it also travels from higher concentration to outside lower concentration through semi-permeable membrane.

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What are the division based on coelomic cavity .Give examples of each

Posted by Divyank Pandey 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Dude ? 7 years, 1 month ago

Acelomate-ex :platyhelminthes.pseudocelomic-ex:nematoda.celomate or eucelomate-ex:annelida

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How can we study properly

Posted by Jayasuriya Swetha 7 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Arya Yadav 7 years, 1 month ago

What a ques bro....just frgt phn fr bttr concentration.........

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Khiladi Bhai 7 years, 1 month ago

First fall tell me that if you don't know how to study properly so how you have come in 9th standard with study or without study

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Ananya Satapathy 7 years, 1 month ago

By not asking such questions we can focus on studies?

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Abhyanand 7 years, 1 month ago

Set your mind I am study only 20 minutes

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Will objects with greater relative density sink or float in water

Posted by Mrinal N 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

When the relative density of a substance is less than 1, it will float in water otherwise it will sink in water. The relative density of ice is 0.91, thus, it floats in water. If the relative density of an object is less than 1, compare to the liquid in which it is immersed, the object will sink otherwise object will float.

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Abhimanyu Paswan 7 years, 1 month ago

Objects with greater relative density will sink in water

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Briefly explain why some object float and some sinks in water.

Posted by Chandan Dhillon 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Pratham Muniyar 7 years, 1 month ago

When the density of the object is more than density of water , the object will sink Whereas When the density of object is less than density of water the object will float

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Write difference between nitrification and determination

Posted by Megha Awasthi 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Megha Awasthi 7 years, 1 month ago

Determination nii dentrification

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Backing soda formula

Posted by Sampat Shinare 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Kusum Balmiki 5 years, 11 months ago

Write the role of atmosphere in climate control

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What is metta?

Posted by Clash Of Clan 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Abhyanand 7 years, 1 month ago

Those things have mass and occupies space is called matter

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How to reproduce chaldren

Posted by Rehan Ahmed Malnas 5 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Abc Kumar 7 years, 1 month ago

By reproduction method

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Define uniform motion (1 mark)

Posted by Ranjithkumar Student11 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

As the object covers equal distances in equal intervals of time, it is said to be in uniform motion.
Example- Motion of planets around Sun, they revolve at a constant speed. So the distance travelled in every equal time period is equal

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A solid weighs 60 gram in air and 45 gram in water calculate the relative density of solid

Posted by Aditya Parmar 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

Why aquatic plants float on water.

Posted by Rahul Dubey 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

In aquatic plants,large air cavities are present in parenchyma to give buoyancy to the plants to help them to float. Such parenchyma type is called are aerenchyma.

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Abhyanand 7 years, 1 month ago

Because the present of air vaccual aquatic plant float on water

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Write the steps used in a land fill?

Posted by Smiley Girl. 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Most of the solid waste in urban areas is dumped in low line areas of ground and covered with earth to level the uneven ground. This method is called landfill.

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What is charge of oxygen

Posted by Varun Tripathi 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Rahul Dubey 7 years, 1 month ago

2 minus

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What is phanerogams

Posted by Amit Acharjee 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Abhyanand 7 years, 1 month ago

Phanerogarms mens those plant produced seed

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Can u explain me Daltons atomic theory

Posted by Binish Fatima 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

Dalton’s atomic theory can be explained as follows:

1) Matter is made up of atoms. Atoms are indivisible and indestructible.

2) All atoms of a certain element are identical in mass and properties.

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangement of atoms.

In short we can say that,

Dalton’s atomic theory states that matter consists of indivisible particles called atoms of a given element are all identical and can neither be created nor destroyed. Compounds are formed by combination of atoms in simple ratios to give compound atoms (molecules).

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Describe the problem faced by the weimer republic

Posted by Dhanush Dhanush 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Abhyanand 7 years, 1 month ago

Weimer Republic was Germany government in 1918 to 1933.In Germany war1 and nazism policy is called Weimer Republic

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Gaurav Seth 7 years, 1 month ago

The problems faced by the Weimar Republic were:

→ Versailles treaty: The Versailles Peace Treaty at the end of the First World War dispossessed Germany of its territories, its resources and its pride as a nation. He also had to pay 6 billion pounds as war compensation. In spite of the harsh terms, the Weimar Republic accepted the humiliating treaty, thereby making it unpopular amongst the German masses.

→ Economic Crisis: The German state was financially crippled due to overwhelming war debts which had to be paid in gold. Subsequently god reserves depleted and value of German mark fell. Prices of essential goods rose dramatically.

→ Political defects: The Weimar Republic was weak due to inherent constitutional irregularities such as proportional representation and Article 48 (which gave the President the power to impose emergency and rule by decree). The democratic parliamentary system seemed to give the people no solutions or benefits in the times of the severe economic crisis.

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Explain sound and charatics of sound waves and charatics of sound in detail

Posted by Anshul Jaiswal 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Abhyanand 7 years, 1 month ago

Section is wrong sanctions

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Abhyanand 7 years, 1 month ago

Sound is the form of energy and it's wave travel in the form of compression and rearrfection and it's character is the section of hearing

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Gaurav Seth 7 years, 1 month ago

Sound is a type of energy. Sound travels in the form of wave from one place to another.

Production of sound:

Sound is produced because of the vibration of any object. In other words, when an object is vibrated it produces sound.

Examples:

Sound can be produced by clapping of palms.
Sound can be produced by vibrating a string.
Sound can be produced by beating a table or diaphragm of a drum.
Sound is produced by a flute because of vibration of air column.
Sound is produced by a guitar because of vibration of its string.

Thus, an object is needed which could be vibrated to produce sound.

Characteristics of sound wave:

Following are the main characteristics of sound wave:

Wavelength
Amplitude
Time period
Frequency
Speed

To discuss the characteristics of wave, a graphical representation of sound wave is considered.

The peak of a wave is called compression or crest. The valley of a wave is called rarefaction or trough.

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What is different between climat and weather

Posted by Arvind Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Jitender Jangid 7 years, 1 month ago

Climate refer sum total of weather conditions and variations over an area at any point of time while, weather refer to state of atmosphere over an area at any point of time.

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Explain the term nitrogen cycle , carbon cycle and oxygen cycle with diagram also

Posted by Kajal Karani 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Akanksha Maurya 7 years, 1 month ago

Nitrogen cycle – The sequence im which nitrogen passes from atmosphere to the soil and organisms and then eventually released back into the atmosphere ,is called nitrogen cycle. Oxyen cycle – The cyclic process by which oxygen is circulated through living and non-living components of the biosphere constitutes. Carbon cycle – The cyclic process in which CO2 is used by plants and release back CO2 to atmosphere by decaying and on burning . For diagrams see ncert book page no.198,199,200 Hope it helps you sis....?

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What is the relationship between metre and nanometer ?

Posted by Sanket Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is collid

Posted by Rahul Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Vanshika Arora 7 years, 1 month ago

It appears to be homogeneous but actually it is a heterogeneous mixture of solute and solvent. The solute particles are between 1/10 raise to power 7 cm and 1/10 raise to power 5 cm in diameter which neither dissolve nor settle down in the solvent.

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Atomic number

Posted by Mohit Talmale 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Ritu Jha 7 years, 1 month ago

It is the no.of proton in an atom. No.of proton = Atomic no. It is denoted by 'Z'

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What is the kinetic energy of spring? I hope that any of you can answer my question in detail..

Posted by Manju Mordhaya 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Abhyanand 7 years, 1 month ago

Spring=1/2kx^2 ,k is the spring constant and x is the how much strached .spring energy in the two form one is the elastic and other is compressive both are called restored energy force

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Conservation of movementum

Posted by Pratik Vishwakarma 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Arya Yadav 7 years, 1 month ago

It menas....Whn two bdy collied in isolated system..then during collision totsl momentum is always conserved.... M1U1+M2U2=M1V1+M2V2 Total initial momentum= total final momentum..

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Arya Yadav 7 years, 1 month ago

That is momentum...not movementum....

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