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

The third law of motion states that to every action there is an equal and opposite reaction and they act on two different bodies this force is also known as action reaction force

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Tanishq Pandya 5 years, 2 months ago

The third law of motion states that to every action there is an equal and opposite reaction and they act on two different bodies. ________________________ Hope it helps you

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The kinetic energy of an object of mass m moving with a velocity is double what will be it kinetic energy when it's velocity increase three times

Posted by Anisha Harun 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Tamanna Sarfraz 5 years, 2 months ago

Kinetic energy will increase 3 more time

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Write about Velocity time graph

Posted by Khusi Pradhan 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Pallavi Bharti 5 years, 2 months ago

We can derive acceleration by the slope of v-t graph and displacement by area under v-t graph

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Vivek Rana 5 years, 2 months ago

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How cells are formed ?

Posted by Saksham Singh 5 years, 2 months ago

CBSE > Class 09 > Science

3 answers

World Wide Handsome💜 5 years, 2 months ago

Cells which already exists produces other cells hope it helped my friend☺

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Tanishq Pandya 5 years, 2 months ago

New cells are formed by the process of cell division. There are two main types of cell division:- mitosis and meiosis. the process of cell division by which most of the cells divide for growth is called mitosis. in this process each cell called mother cell divides to form two identical daughter cells. the daughter cells have the same number of chromosomes as mother cell. it helps in the growth and repair of tissues in organisms. _________________________ Hope it helps you!

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Vidhi Agarwal 5 years, 2 months ago

Cells are formed from pre existing cells. According to cell theory..

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What is resoursise

Posted by Sania Amee 4 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 9 months ago

Resource refers to all the materials available in our environment which help us to satisfy our needs and wants. Resources can broadly be classified upon their availability — they are classified into renewable and non-renewable resources.

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Two elements X and Y are there. The element X has electronic configuration 28I. The element Y has electronic configuration 2,8.7. These two elements combine to form a chemical compound. Identify element X and Y. Draw their atomic structures. Name the compound form in this cuample. Also calculate its molecular mars Write the valencies of these elements.

Posted by Rutva Barai 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Mona Singh 5 years, 2 months ago

X=sodium and y=cloride Na=1 and cl=-1 the compound form is nacl. Two el in k shell anso on.

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Define motion and there types

Posted by Vivek Kumar 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Tanishq Pandya 5 years, 2 months ago

The movement of an object from one position to another position with respect to time is called motion. Ex. :- uniform motion non-uniform motion, motion along a straight line, etc.

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Vidhi Agarwal 5 years, 2 months ago

When any object changes its place or position it is said to be in motion. There are many types of motion for ex. Periodic motion(Vibratory motion), etc..

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Air pollution cause effect or prevention

Posted by Vishakha Singh 5 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Gshshs [email protected] 5 years, 2 months ago

Effect

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Yash Nirmalkar 5 years, 2 months ago

Effect..

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Prachi Raj 5 years, 2 months ago

Effect , budhu

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Preparation of : a) A true solution of common salt, sugar and alum

Posted by Kanishka Solanki 5 years, 2 months ago

CBSE > Class 09 > Science

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Preparation of : a) A true solution of common salt , sugar and alum

Posted by Kanishka Solanki 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Arshpreet Singh Ubhi 5 years, 2 months ago

Transparency,Filtration criterion ,Stability

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Difference between atomic mass and atomic weight

Posted by Prince Raj 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Bharti Yadav 5 years, 2 months ago

Atomic mass 1. Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. 2.It is the average weight of an element. 3. Atomic mass is denoted by A Atomic number 1. Atomic number is usually the number of protons present in an element’s nucleus 2. It is the total number of nucleons in the atom’s nucleus. 3. It is denoted by Z

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Gravitational chapter notes

Posted by Vivek Rana 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Vivek Rana 5 years, 2 months ago

This is not blue print

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Vathsala Prabhu 5 years, 2 months ago

https://kseebsolutions.in/kseeb-solutions-for-class-9-science-chapter-10/ Look into it..

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What is ozone depletion

Posted by Vishal Thakur 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

धर्मेंद्र कुशवाह 5 years, 2 months ago

Due to global warming

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Name the cleansing organelle in the cell.

Posted by Andy Decision 5 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Tanishq Pandya 5 years, 2 months ago

Ans:- Lysosomes also known as suicide bags

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Kapil Dhawan 5 years, 2 months ago

lysosomes

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Arpit Shankar 5 years, 2 months ago

Lysosomes

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Priyal Gupta 5 years, 2 months ago

Lysosomes are the cleaning organelle in the cell . They are also called the suicider bags of a ce ll

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Deleted syllabus of CBSE class 9

Posted by Vivek Rana 5 years, 2 months ago

CBSE > Class 09 > Science

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What is the 2nd law of motion

Posted by Vanshita Chauhan 5 years, 2 months ago

CBSE > Class 09 > Science

4 answers

धर्मेंद्र कुशवाह 5 years, 2 months ago

Rate of change of momentum is directly proportional to the force

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Arpit Shankar 5 years, 2 months ago

The rate of change of momentum of an object is proportional to the applied force acting on the object

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Adhish Annamalai 5 years, 2 months ago

Second Law of Motion: The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force.

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Priyal Gupta 5 years, 2 months ago

The acceleration of an object is directly proportional to the net force exerted and inversely proportional to the object's mass.

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were the similar both times

Posted by Suman Kumari 5 years, 2 months ago

CBSE > Class 09 > Science

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Important question answer of science

Posted by Vivek Rana 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Suchitra Sen 5 years, 2 months ago

All questions are important...

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Important chemical formula

Posted by Vivek Rana 5 years, 2 months ago

CBSE > Class 09 > Science

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Important chemical formula That always come in exam

Posted by Vivek Rana 5 years, 2 months ago

CBSE > Class 09 > Science

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Who discovered the first vaccine and for which disease discuss the principle of vaccination class 9th

Posted by Deepanjali0108 Avika 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Suchitra Sen 5 years, 2 months ago

The first vaccine discovered was smallpox vaccine it was discovered by Edward Jenner in 1796.It prevent us from one of the contagious disease smallpox.

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10. Calculate the number of molecules of sulphur (S8) present in16 g of solid sulphur.

Posted by Shreyas Daundkar 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Shreyas Daundkar 5 years, 2 months ago

Ans. 1mol of S8 = molecular mass of S8 = 32 x 8 = 256u=256g since 256g of S8= 1mol = 6.022 x 1023 atoms (Avogadro number) 16g of S8= 16x6.022 x 1023/256 = 3.76x1022 molecules.

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What is the difference between aqueous and non- aqueous solution?

Posted by Sinchan Gupta 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

धर्मेंद्र कुशवाह 5 years, 2 months ago

The solution in which solvent is water is called aqueous solution And the solution in which solvent is other liquid apart from water is called non aqueous solution

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A 8000 kg engine pulls a train of 5 wagons each of 2000 kg along a horizontal truck if the engine exerts a force of 40000 n and the truck offers a friction force of 5000 n then calculate the force of wagon 1 and 2

Posted by Kiranvir Kaur 4 years, 10 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 10 months ago

The external force is only applied to waggon 1 directly. On the last four waggons, the net force is equal to the force added to waggon 2 by waggon 1.

Let us consider the acceleration of the wagons is a_w

35000 = 5m × a_w

a_w = 35000/5m

a_w = 35000/(5 × 2000)

a_w = 3.5 m/s²

Then the mass of the last four wagons can be considered as m_w

m_w = 2000 × 4

m_w = 8000 kg

Now let us calculate the net force on the last four wagons

F’ = m_w× a_w

F’ = 8000 × 3.5

F’ = 28000 N

∴ The force of wagon-1 on the wagon-2 is 28000N.

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An object has moved through a distance.can it have zero displacement ? if yes support your answer with an example?

Posted by Kamran Javid 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Lavanya Singh 5 years, 2 months ago

Yes , zero displacement is possible if an object has moved through a distance. Suppose a body is moving in a a circular path and starts moving from point a and it returns back at same point after completing one revolution then the distance will be equal to its circumference while displacement will be zero.

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If there is 7 horse power in a lambourgini car . Then what's is the speed of this car?

Posted by Aayush Singh@8 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Vidhi Agarwal 5 years, 2 months ago

?????mtlb kuch b..

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Broucher on sikkim project

Posted by Hema Gupta 5 years, 2 months ago

CBSE > Class 09 > Science

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Define momentum and state its S.I unit.

Posted by Navjot Kaur 5 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Adhish Annamalai 5 years, 2 months ago

Momentum: The momentum of an object is the product of its mass and velocity and have the same direction as that of the velocity. SI unit of Momentum: It's SI UNIT is Kg m s^-2

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Aneesha Jat 5 years, 2 months ago

I don't know

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Swati ? 5 years, 2 months ago

The Product of mass and velocity is called momentum and its S.I unit is kg.m/s(kilogram meter per second) .

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What is health in ch-13 class 9th

Posted by Mohit Rathi 5 years, 2 months ago

CBSE > Class 09 > Science