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

Let two bodies one of mass m1 and other of m2 is moving with initial velocities u1 and u2 and final velocities v1 and v2 respectively. dt= short time interval of collision For 1st body , Initial momentum =pi=m1u1 Final momentum =pf=m2u2 A/Q Newtons second law of motion F directly proportional to Rate change of mometum F directly proportional to change in momentum ÷ Time taken. ( F directly proportional to m1v1-m1u1÷dt)-------(1) For 2nd body! Initial momentum =m2u2 Final momentum = m2v2 A/Q Newtons second law of motion F directly proportional to Rate change of mometum F directly proportional to change in momentum ÷ Time taken (-F directly proportional to m2v2-m2u2÷dt) (F directly proportional to - - - -(m2v2-m2u2÷dt))------(2) From (1)and(2) m1v1-m1u1÷dt =-( m2v2-m2u2)÷dt m1v1- m1u1= -m2v2+m2u2 m1u1 +m2u2=m1v1 +m2v2 HOPE THIS HELP!

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Ash Greninja 5 years, 3 months ago

Of which momentum, energy, mass

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ANSWER

Identify suspension from the following : i) lemonade 2) muddy water 3) copper sulphate solution

Posted by Jashith Sharma 5 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Theshiga Elangovan 5 years, 3 months ago

Muddy water

1Thank You

Jaswant Singh 5 years, 3 months ago

May be muddy water

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Abhijeet Kumar 5 years, 3 months ago

Muddy water

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Sarita Panda 5 years, 3 months ago

Muddy water...

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A stone is dropped down to a deep well from rest the well is 50m deep. How much time will it take to reach the bottom of well if a= 9.8m/ s2

Posted by Aditi Gupta 5 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Yerrabolu Chakradhar 5 years, 3 months ago

Distance s = 50 meter Initial velocity u = o We need to calculate the time, Using equation of motion, Where, s = height g = acceleration due to gravity t = time Put the value into the equation Hence, The stone reached the bottom of the well in 3.2 sec.

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Yogita Ingle 5 years, 3 months ago

Distance s = 50 meter

Initial velocity u = o

We need to calculate the time,

Using equation of motion,

Where, s = height

g = acceleration due to gravity

t = time

Put the value into the equation

Hence, The stone reached the bottom of the well in 3.2 sec.

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ANSWER

What is a mind map?

Posted by Sarita Panda 5 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 5 years, 3 months ago

A Mind Map is a diagram used to visually outline information. A mind map is often created around a single word or text, placed in the center, to which associated ideas, words and concepts are added. Major categories radiate from a central node, and lesser categories are sub-branches of larger branches.

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Abhishek Ladda 5 years, 3 months ago

Whole outcome of lesson in some points through a flow chart.....

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ANSWER

If 30 students shake hand to each others . How many times shake hand to each other. ( Hint - Maine pucha ki agar 30 students apas Mai hand shake karege toh kitne Baar total hand shake hoga )

Posted by Vaibhav Kumar 5 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Manoj Tomar 5 years, 3 months ago

Ayr jitne bar unki margi hogi utne hee bar to karange???

1Thank You

Shabd Kumar 5 years, 3 months ago

Wow

2Thank You

Vaibhav Kumar 5 years, 3 months ago

Correct answer is 435 hand shake

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ANSWER

when 0.84 grams of an antacid tablet containing mangense carbonate as active ingredent and some inert materials was treated with 61.12 grams of an acid solution, carbondioxide was liberated. the mass of the resulting solution weighed after the effervescence ceases was found to be 61.52g. applying the law of conservation of mass, calculate the mass of carbon di oxide

Posted by Venkatesh Murthy 5 years, 3 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Read full. कल पागल दिवस है THIK HAI ?? ?? आपकी नजर मे जो पागल हो उसे भेजो THIK HAI मैने तो भेज दिया है THIK HAI ?? ?? ?वापस मुझे भेजकर महापागलो वाली हरकत मत करना THIK HAI पागलो की चार निशानीयां १. एक हाथ मे मोबाईल पकड़ना २. अगूठे से स्क्रीन टच करना ३. मैसेज पढ़कर मुस्कराना ४. फिर सोचना किसको भेजू THIK HAI ये मैसेज जिस खुब ??? सूरत ईन्सान को मिलती है वो पॉच सैकन्ड बाद बेहोश हो जाता है THIK HAI १ २ ३ ४ ५ नही हुए खूब सूरत होते तो बेहोश हो जाते THIK HAI उफ मुझे तो बहुत मुस्किल से होश आया था THIK HAI ??? ?? हंसो मत अपने सभी पागल मित्रो को भेजो THIK HAI और दुसरो को भी हंसाओ THIK HAI ?? ?? ??THIK HAI THIK HAI ?? ```????? 5 बातें आपके बारे में You You You You You You You You You You You You You You You You You You You you you you you you you you you you you you you you you you you you you you you you you you you 1. आप इतने आलसी हैं कि आपने पूरे you नही पढ़े 2. आपने ये भी नहीं देखा कि मैने you के बीच में yoo भी लिखा है ! 3. अभी आपने yoo को देखा 4. अब आप हस रहे हैं क्योंकि आपको yoo नही मिला और आप पागल बन गये हैं ?????????? मैं आपके बारे में 13 बाते जानता हूं ......... 1. आपने इस समय अपना मोबाइल पकड़ रखा है ! 2. आप व्हाट्स एप्प इस्तेमाल कर रहे हैं ! 3. आपने अभी अभी मेरा मैसेज खोला 4. अभी आप इसे पढ़ रहे हैं ! 5. आप मनुष्य हैं 7. आप अपने होंठों को बिना मिलाये p नही बोल सकते 8. अभी आपने ऐसा करने का प्रयास किया 9. अब आप अपने आप पर हस रहे हैं ! 10. इस समय आपके चेहरे पर मुस्कराहट है ! 11. आप ने 6 नम्बर का प्वाइंट छोड़ दिया 12. आपने अभी चेक किया कि 6 नम्बर तो वहां है ही नहीं 13. अब आप हस रहे हैं क्योंकि मैने आपको फिर से उल्लू बना दिया यह सही है ना ? अब आप दूसरों को बनाएं उल्लू ??? dhamaka apna hi hona chahiye``` . ????? ?????

Posted by Vaibhav Kumar 5 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Mukul Kumar 😎 5 years, 3 months ago

It has become very old bro

2Thank You

Vaibhav Kumar 5 years, 3 months ago

Thanks Karna mat bhulna

5Thank You

ANSWER

A body is moving in a straight line and it's displacement at various instants of time are given in the following table:- Time 0 1 2 3 4 5 6 7 Displacement 4 6 10 10 10 16 20 24

Posted by Neha Malhotra 5 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Neha Malhotra 5 years, 3 months ago

Plot the displacement time graph

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Shabd Kumar 5 years, 3 months ago

What is the question

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ANSWER

A car accelerates uniformly from 18km/h to 36km/h in 5 second. Calculate the acceleration of the car.

Posted by Neha Malhotra 5 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Yerrabolu Chakradhar 5 years, 3 months ago

a = 1 m/s2 18km/h = 18 * 5/18 m/s = 5 m/s 35km/h = 36 * 5/18 m/s = 10 m/s Here, u = 5 m/s v = 10m/s t = 5 s v = u + at 10 = 5 + 5a 10 - 5 = 5a 5 = 5a 5 / 5 = a a= 1 m/s2

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ANSWER

Why are cells called the functional unit of life?

Posted by Anshika Garg 5 years, 3 months ago

CBSE > Class 09 > Science

5 answers

Palak Lakhotiya 5 years, 3 months ago

Cell is called as functional unit of life as cells get together to form tissue which further makes organs

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Rohan Sawase 5 years, 3 months ago

All the organs perform various functions and they are made up of cells

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Dhruv Aggrawal 5 years, 3 months ago

Becuase without cell we can't survive

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Tanisha Malik 5 years, 3 months ago

It is known as the structural and functional unit of life because all the organisms are made up of it and it also carries out various functions that are essential to live.

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Manoj Tomar 5 years, 3 months ago

Cell is call the functional unit of life because all organs in our is is made of cell.

3Thank You

ANSWER

One atomic mass unit (1u)=_ kg

Posted by Anjali Basumatary 5 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Neha Malhotra 5 years, 3 months ago

1.66×10^-27

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ANSWER

Write three dioatomic molecules

Posted by Anjali Basumatary 5 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Manoj Tomar 5 years, 3 months ago

Diatomic molecules consist of two atoms that are either from the same element or from different elements. ... There are seven elements that naturally occur as homonuclear diatomic molecules in their gaseous states: hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine.

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ANSWER

Short note on sound ?

Posted by Muskan Mishra 5 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Toshika Patel 5 years, 3 months ago

Short note on sound? Sound is the term to describe what is heard when sound waves pass through a medium to the ear. All sounds are made by vibrations of molecules through which the sound travels.

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Chaitan Patel 5 years, 3 months ago

Mole concept

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ANSWER

Which blood vessels have the smallest diameter????

Posted by Palak Pandey 5 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Ram Pal 5 years, 3 months ago

Capillaries

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Palak Lakhotiya 5 years, 3 months ago

Capillaries

1Thank You

Muskan Mishra 5 years, 3 months ago

Capillaries blood vessels have the smallest diameter .

3Thank You

ANSWER

State 3 physical properties on the basis of which metal can be distinguished from metal from non-metal

Posted by Jashith Sharma 5 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Jashith Sharma 5 years, 3 months ago

Thanx a lot

1Thank You

Parth Surmare 5 years, 3 months ago

Malleability, ductility and sonority

1Thank You

Manish Kumar 5 years, 3 months ago

The three physical properties are 1.Density 2.malleblity 3.Ductility

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ANSWER

An obj is thrown from a building and touch the ground in 10 sec. Find the height of the building. Please answer me .

Posted by Aditya Padhan 5 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Dhruv Aggrawal 5 years, 3 months ago

You can use the 2 equation of motion in that case intial velocity is 0 time is 10 sec and we consider aacelartion is 9.8ms2 now we have to find distance

1Thank You

Parth Surmare 5 years, 3 months ago

Sorry but i have typed it one below the other but after sending it, it has been sent in straight line.

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Parth Surmare 5 years, 3 months ago

Let the height be h t=10s a=9.8m/s^2 u=0m/s v=u+at v=0+9.8(10) v= 98 m/s v^2-u^2=2ah 98^2-0^2=2(9.8)(h) (98*98)÷19.6=h h= 490 m

3Thank You

Salman Ansari 5 years, 3 months ago

What is textile industary

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ANSWER

What is electrocovelency

Posted by Satyam Kumar 5 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Palak Lakhotiya 5 years, 3 months ago

Electrovalency is the type of chemical bonding, that is established by the actual transference of one or more valence electrons, from a metallic atom to a non-metallic atom, so that each of the 2 elements can attain the stable electronic configuration of their respective nearest inert elements in the periodic table.

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Dolly Singh 5 years, 3 months ago

Electrovalency is the number of electrons that an atom either gains or losses in forming an ion.

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ANSWER

An obj is thrown from a building and touch the ground in 10 sec. Find the height of the building.

Posted by Aditya Padhan 5 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Yerrabolu Chakradhar 5 years, 3 months ago

g = 10m/s2 v = u + gt v = 0 + 10(10) v = 100m/s V2 - u2 = 2gh (100)2 - (0)2 = 2(10)h 10000 = 20h h = 10000/20 h = 500m

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ANSWER

Difference between uniform and non uniform motion with examples

Posted by Khushi Arora 5 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Sneha Kanak 5 years, 3 months ago

In uniform motion a body equal distance in equal interval of time, whereas in non uniform motion a body travel unequal distance in equal interval of time

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Manoj Tomar 5 years, 3 months ago

Hlo ap mujay notes send kar sakte ho plz because i revise that ch and our exam is come very soon so plz......... ...help me....

3Thank You

Manoj Tomar 5 years, 3 months ago

1Uniform motion said that work is done in a time period always.example rotation of earth 2 non uniform motion is said that is not depends upon time

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ANSWER

Anyone pls share mind map for gravitation

Posted by Khushi Arora 5 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Suhani Rai 5 years, 3 months ago

https://images.app.goo.gl/Fq51QAPvMDRusaw59

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Manoj Tomar 5 years, 3 months ago

Hii

1Thank You

ANSWER

What is the symbol of chromium?

Posted by Prabhash Kumar Choubey 5 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Yerrabolu Chakradhar 5 years, 3 months ago

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Shubham Sonu 5 years, 3 months ago

1Thank You

Satyam Kumar 5 years, 3 months ago

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Madhur Bhandari 5 years, 3 months ago

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ANSWER

Metal present in haemoglobin

Posted by Suhani Rai 5 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Prabhash Kumar Choubey 5 years, 3 months ago

Iron is a metal no metal is a iron

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Prabhash Kumar Choubey 5 years, 3 months ago

But iron is present in blood

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Prabhash Kumar Choubey 5 years, 3 months ago

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Maitri Sharma 5 years, 3 months ago

Metal is IRON hope it'll help

2Thank You

ANSWER

Calculate the average density of Earth in terms of g,G and r?

Posted by Dolly Singh 5 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Madhur Bhandari 5 years, 3 months ago

The gravitational constant g is given as: g=GM/R² or M= g*R²/G⇒Density D=mass/volume=g*R²/G*Ve (Where Ve is the volume of the earth ) D=g*R²/G*4/3πR³=3g/4πGR Hence, the average density of the earth in terms of g, G and R is 3g/4πGR

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ANSWER

Match the following:- Column I Column II 1 . Sodium a. Yellow in colour 2 . Helium b. Diatomic 3. Sulphur c . Soft metal 4. Hydrogen d. Noble gas

Posted by Suhani Rai 5 years, 3 months ago

CBSE > Class 09 > Science