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

Thomson model of atom is discovered by Thomson. He said that the atom is like a watermelon. The red part of watermelon is positive charge and the seeds of watermelon are electron. This model is called as plum pudding Model. Thanks.

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Law of constant proportions ?

Posted by K_Hushii 🍁 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Anushka Yadav 4 years, 1 month ago

According to Joseph proust ' In a chemical substance the elements are always present in a fixed proportion by mass" thank you!

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What is an ion ?

Posted by K_Hushii 🍁 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Rishabh Sharma 4 years, 1 month ago

Positively or negatively charged particles

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Jiya Sain 4 years, 1 month ago

Why will a sheet of paper fall slower than one that is crumpled Into a ball ?

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Anushka Yadav 4 years, 1 month ago

An ion is something that a body attains when it losses and gain electron. It is of two type 1) cation ( positively charged) 2) anion ( negatively charged) Thankyou hope it will help !

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Daksh Patel 4 years, 1 month ago

A charged atom is known as an ion . Positively charged ion : cation ,negatively charged ion : anion

3Thank You

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What is cell division ?

Posted by K_Hushii 🍁 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Jiya Sain 4 years, 1 month ago

Cell division is the process by which a parent cell divides into two or more daughter cell .

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What is Potential energy.....

Posted by K_Hushii 🍁 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Neha Kanchan 4 years, 1 month ago

An energy possessed by a body due to its height is called potential energy

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Chenika Goel 4 years, 1 month ago

An energy is possessed by on its height

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I need some case study of chapter 10 gravitational

Posted by Tanjila Khan 4 years, 1 month ago

CBSE > Class 09 > Science

0 answers

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What do you mean by universal law of gravitation

Posted by Gopal Sharma 4 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Chenika Goel 4 years, 1 month ago

And combined these terms F= GMm÷dsq Universal Law of conservation

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Chenika Goel 4 years, 1 month ago

F is inversely proportional 1÷dsq

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Chenika Goel 4 years, 1 month ago

F is directly proportional M×m

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Tausif Alam 4 years, 1 month ago

According to the Newton's universal law of gravitation "the force of attraction between two object is directly proportional to the product of their masses and inversely proportional to the square of the distance between them".

1Thank You

Sadiya Mokashi 4 years, 1 month ago

Newton's universal law of gravitation states that every particle in the universel attracts every other particle with a force along a line joining them. The force is directly proportional to the product of their masses and inversely proportional to the square of the distance between them

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What is relative- density?

Posted by K_Hushii 🍁 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sanket .........✨ 4 years, 1 month ago

Relative density, or specific gravity, is the ratio of the density of a substance to the density of a given reference material. Specific gravity for liquids is nearly always measured with respect to water at its densest; for gases, the reference is air at room temperature.

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what is buyoncay ?

Posted by K_Hushii 🍁 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Sanket .........✨ 4 years, 1 month ago

Good morning bestie !

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Sanket .........✨ 4 years, 1 month ago

Buyoncay is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid.

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Give a mathematical proof of Archimedes principal

Posted by Babu Jat 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

K_Hushii 🍁 4 years, 1 month ago

Ah = V, vol of the body = vol of liquid displaced

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Formula of sun, glucose

Posted by Mohd Rehan 4 years, 1 month ago

CBSE > Class 09 > Science

0 answers

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A person holds a bundle of hay over his head for 30min and gets tired. Has he done some work or not ? Justify your answer.

Posted by K_Hushii 🍁 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Rishabh Sharma 4 years, 1 month ago

No because there is no displement

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Lokesh Bawal 4 years, 1 month ago

Since there is not horizontal movement nor vertical movement hence there is no displacement. And hence work=force*displacement Work=force*0 Work=0 Therefore No work is done

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Sanket .........✨ 4 years, 1 month ago

Oh Monday se mera bhi daily ka ho gya school !

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Hanshika Sri 4 years, 1 month ago

No , it will be considered as zero work

1Thank You

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Formula Unit Mass of MgSO4.7H2O

Posted by Sanskar Bhushan 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Preeti Goswami 4 years, 1 month ago

139u

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Ex 10.1 ki calculation

Posted by Chenika Goel 4 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

Atomic masa.kaysay.nekaltay hai puzzle

Posted by Sirhan Chran Charan 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

K_Hushii 🍁 4 years, 1 month ago

By adding together the no. of protons and neutrons and multiplying bu 1 amu...... bcz each proton and each neutron weigh one atomic mass unit (amu) ......

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What is galileo's law ?

Posted by K_Hushii 🍁 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Sanket .........✨ 4 years, 1 month ago

Aur kya kr rhi ho...

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Sanket .........✨ 4 years, 1 month ago

Exam kaisa gya ?

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Sanket .........✨ 4 years, 1 month ago

Galileo's law of free fall states that, in the absence of air resistance, all bodies fall with the same acceleration, independent of their mass.

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Write short notes on vaccination and immunisation

Posted by Yatharth Yadav 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Preeti Goswami 4 years, 1 month ago

Immunization is the process by which an individual immune system becomes strong against an disease

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Gursahib Singh 4 years, 1 month ago

Immunization is the process by which an individual's immune system becomes fortified against an infectious agent. Vaccination is The act of introducing a vaccine into the body to produce protection from a specific disease.

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What is ohm's law

Posted by K_Hushii 🍁 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Lokesh Bawal 4 years, 1 month ago

According to Ohm's law, Current through conductor in the circuit is directly proportional to the voltage across ends of conductor.

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Sanket .........✨ 4 years, 1 month ago

Ohm's law, description of the relationship between current, voltage, and resistance. The amount of steady current through a large number of materials is directly proportional to the potential difference, or voltage, across the materials. ... Ohm's law may be expressed mathematically as V/I = R.

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Drawback of bohr model

Posted by K_Hushii 🍁 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Hansika Aggarwal 4 years, 1 month ago

No draw backs

0Thank You

Tanveer Kaur 4 years, 1 month ago

There is no draw backs

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Sanket .........✨ 4 years, 1 month ago

It cannot explain the spectrum of atoms other than hydrogen, for example, helium atom, which possesses only two electrons. Also, it unable to explain the splitting of spectral lines in the presence of a magnetic field (Zeeman effect) or an electric field (Stark effect).

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