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

When we stand on the floor our body exerts force on the floor due to 3rd law of motion floor also exert foce on us so we are feeling tired after sometime

2Thank You

Krishna Chaudhary 7 years, 7 months ago

Jub hum kisi body pe force lagte hai tab bhi wo hamare tarap force lagata hai.for example agar hum ek muka se diwar par 5n ka force apply karte hai to wo vi hume itni hi jor se means 5N force se dakhelti hai issliyea hamea chot lagti hai

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ANSWER

Explain why a solution of salt in water is considered as a mixture and not compound?

Posted by Anshika Gupta 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Abhiram Pervela 7 years, 7 months ago

Compounds can be made only by taking the solute and solvent in specific ratios . In compounds we cannot get back the actual substances after its preparation . But salt water is considered as a mixture because we can get back the salt through evaporation techniques

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ANSWER

State two reasons to support that brass is a mixture and not a compound

Posted by Anshika Gupta 7 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

'Compounds are homogeneous but mixture may be homogeneous or hetrogeneous'. Explain this statement with example.

Posted by Anshika Gupta 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Maloy Mandal 7 years, 7 months ago

Yes

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ANSWER

What is the difference between an atom of hydrogen and a molecule of hydrogen

Posted by Bhavesh Patel 4 years, 10 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 10 months ago

A hydrogen atom has only one atom of hydrogen and may not have independent existance but a Hydrogen molecule has two atoms of Hydrogen which has stable existance. Similarly all unstable atoms and elements have more than one atom.

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ANSWER

How does an atom differ from molecules

Posted by Bhavesh Patel 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Jay Joshi 7 years, 7 months ago

Many molecules are mix then make an atom

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ANSWER

Write mathematically solved newton 2 law of motion

Posted by Anjali Rawat 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Vivek Mishra 7 years, 7 months ago

Force acting on a body =mass of the body ×acceleration produced in the body

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ANSWER

Differentiate between distance n displacement

Posted by Manya Sethia 7 years, 7 months ago

CBSE > Class 09 > Science

4 answers

Jay Joshi 7 years, 7 months ago

Distance means any object travelled from the initial to final and itis a scalar quantity. And displacement means the short est distance measured in two points is called displace ment . It is vector quantity

1Thank You

Janvi Kashyap 7 years, 7 months ago

Distance can't be zero and Displacememt can be zero

2Thank You

Sonali Aggarwal 7 years, 7 months ago

Distance is nothing but total path covered by any body but displacement is shortest path between starting and ending point.

2Thank You

Pragya Shah 7 years, 7 months ago

Distance is the length travelled by object from its initial to final position but displacement is the shortest distance travelled by object from its position.

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ANSWER

What is the meaning of conservation of momentum?

Posted by Riyaz Malik 7 years, 7 months ago

CBSE > Class 09 > Science

4 answers

Sonu Patel 7 years, 7 months ago

It means( momentum before collision=momentum after collision ) M1V1+M2V2=M1U1+M2U2

3Thank You

Sonali Aggarwal 7 years, 7 months ago

Conservation of momentum simply means that momentum is conserved before and after any action , hence the product of mass and velocity is same before and after the action.

2Thank You

Pragya Shah 7 years, 7 months ago

It means that how can we conserve and balance the initial and the final momentum.

3Thank You

Chauhan Pooja 7 years, 7 months ago

The meaning of conservation of momentum means the thing which is in movment

1Thank You

ANSWER

What happens when you pour some Acetone on your plam

Posted by Om Patel 7 years, 7 months ago

CBSE > Class 09 > Science

4 answers

Yetish Patnaik 7 years, 7 months ago

When we pour some acetone on our hand it receives the latent heat from our hand to evaporate and we feel cool

1Thank You

Suryansh Agarwal 7 years, 7 months ago

When we pour some acetone on our palm , it evaporates quickly by the heat energy provided to it by our palm. As it's boiling point is very low it evaporates very quickly. As the acetone takes heat energy from our palm , our palm looses temperature and we experience cooling effect of evaporation on our palm

1Thank You

Pragya Shah 7 years, 7 months ago

When we pour some acetone on our palm , it makes us feel cool by evaporating the heat of our body.

1Thank You

Om Patel 7 years, 7 months ago

I don't knoe

3Thank You

ANSWER

What is absolute rest?

Posted by Kartik Aggarwal 7 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is discover by the free cell

Posted by Nilesh Chauhan 7 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Long tipe and short tipe

Posted by Amrithesh Ps 7 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

How many bones in a rat body???

Posted by Akshat Sharma 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Mayank Joon 7 years, 7 months ago

263

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ANSWER

Calculate the force of gravitation due to earth on a ball of1kg mass lying on the ground. Mass of earth =6 ×10^24 kg.radius of earth =6.4×10^3kg .G=6.7×10^(-11)

Posted by Nandana Nair 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Akshat Sharma 7 years, 7 months ago

Answer is 9.8 newton

3Thank You

ANSWER

Name large animal of water

Posted by Aman Jethuri 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Abhiram Pervela 7 years, 7 months ago

Walrus

1Thank You

ANSWER

Derive second law of motion from first law of motion

Posted by Pooja Raghuvanshi 7 years, 7 months ago

CBSE > Class 09 > Science

4 answers

Akshat Sharma 7 years, 7 months ago

According to Newton's first law of motion a body at rest will remain at rest and if a body at motion will countinue in motion unless it is compelled to exert force changing the state of rest or uniform motion. According to the Newton's second law of motion change in momentum with respect the time.

1Thank You

Mohini Kaur 7 years, 7 months ago

you helped alot.

0Thank You

I Am A Cheater 7 years, 7 months ago

The question is wrong I think it should be derive 1st law of motion from second law

0Thank You

School Student 7 years, 7 months ago

❤❤?

1Thank You

ANSWER

To study the third law of motion using spring balance

Posted by Poonam Nehra 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 6 months ago

Newton’s Third Law of Motion states: ‘To every action there is an equal and opposite reaction’.
It must be remembered that action and reaction always act on different objects. The Third Law of Motion indicates that when one object exerts a force on another object, the second object instantaneously exerts a force back on the first object. These two forces are always equal in magnitude, but opposite in direction.
These forces act on different objects and so they do not cancel each other. Thus, Newton’s Third Law of Motion describes the relationship between the forces of interaction between two objects.
Whenever two bodies interact with each other, the force exerted by the first body on the second is called action. The force exerted by the second body on the first body is called reaction. The action and reaction are equal and opposite.
For example, when we placed a wooden block on the ground, this block exerts a force equal to its weight, W = mg acting downwards to the ground. This is the action force. The ground exerts an equal and opposite force W’ = mg on the block in the upward direction. This is the reaction force.

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ANSWER

Is mass be negative why?

Posted by Utkarsh Raj 7 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Hindi meaning of Ambulance

Posted by Kundan Yadav 7 years, 7 months ago

CBSE > Class 09 > Science

2 answers

Kundan Yadav 7 years, 6 months ago

Iaka hoga rogi wahan

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Tejaswini Rai 7 years, 7 months ago

आपत्ति मददगार Van

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ANSWER

If kinetic energy of a body increases by 300% then its momentum increased by

Posted by Sujal Anant 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 7 months ago

Kinetic energy, KE = (1/2) × m×v²

Linear momentum, P = m v

if kinetic energy of the body is increase by 300% then

New KE becomes 4 times (1/2)×m ×v²and

can be given as (1/2)× m ×(2v)²since

other factors will not change being constants.

∴ New Linear momentum becomes 2 (m v) i.e. increased by 100% .

1Thank You

ANSWER

Suggest a method for calculating the mass of moon

Posted by Pragya Mishra 7 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Akshat Sharma 7 years, 7 months ago

Method by gravitation

1Thank You

Pragya Mishra 7 years, 7 months ago

The acceleration due to the gravity on the moon is one sixth the acceleration due to the gravity. The radius of moon is 1.74 ×10 power 6 m and the value of gravitational constant is 6.67 ×10 pwer -11 nm square kg power -2.

0Thank You

Krishna Jindal 7 years, 7 months ago

Go to space

2Thank You

ANSWER

Pahle murgi ya andq

Posted by Rohan Kumar 7 years, 7 months ago

CBSE > Class 09 > Science

6 answers

Abc Xyz 7 years, 6 months ago

+Akshat sharma oh just shut yr mouth Only study izz ny vrythng Yrr masti vi kuch hoti h ki ni Kuch jyada hi akhrotmila h tumhe Yaara thada sa hume vi dedo Paagal sa???

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Akshat Sharma 7 years, 7 months ago

You are failure you can't learn anything in this app this app for study not for masti and it's exam time.??

0Thank You

Kundan Yadav 7 years, 7 months ago

Anda

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Lakshay Goel 7 years, 7 months ago

Anda pehle aaya

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School Student 7 years, 7 months ago

Anda

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Amitesh Gupta 7 years, 7 months ago

Man

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ANSWER

Why Darwin is linked with natural system of classification

Posted by Raushan Kumar 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 7 months ago

Natural system of classification is based on the basis of both external morphological character and internal features like anatomy, embryology, phytochemistry etc. Darwin also gave emphasis on surface features and correlations. Darwin suggested that surface features correlates underlying causes. Darwin also suggested embryology holds key in identifying species classification. This are the reasons why Darwin is linked with natural system of classification.

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ANSWER

Define the term "TISSUES"

Posted by Niharika ? Chaube? 7 years, 7 months ago

CBSE > Class 09 > Science

4 answers

Yetish Patnaik 7 years, 7 months ago

A group of similar types of cell combine together to perform a function is known as tissue

1Thank You

Akshat Sharma 7 years, 7 months ago

A group of cell that are similar in structure and work together to achive a particular function.

1Thank You

Hital Wadhwa 7 years, 7 months ago

Group of cell which combine together and form a tissue and they also perform a specific task

1Thank You

Riya Shaikh 7 years, 7 months ago

Group of cells which perform a specific task is known as Tissue.

3Thank You

ANSWER

What is a mechanical oragnisms

Posted by Raja Paswan 7 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Difference between 2N and N2

Posted by Karan Rawat 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 7 months ago

1. 2N means two molecules of Nitrogen atom. N₂ means two atoms of nitrogen in its one molecules.

2. N₂ shows that two nitrogen are bonded with covalent bond, and it become nitrogen gas whereas 2N does not show any bond, it just show two number of nitrogen.

3. N₂ is stable molecule, while 2N is nascent hydrogen with no stability.

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ANSWER

How Newton second law define the unit of force ?

Posted by Tsunayoshi Sawada 7 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Ansari Kaif 7 years, 7 months ago

the first law of motion indicates that when an unbalanced external force acts on an object its velocity changesthat is the object gets an acceleration

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ANSWER

What is the function of RER (rough endoplasmic reticulum)

Posted by Harshit Pandey 7 years, 7 months ago

CBSE > Class 09 > Science