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Ask QuestionPosted by Likhitha Lucky 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point. Objects that are fixed relative to Earth – such as a building, a tree, or a sign - make good reference points.
Posted by Palak Pandey 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
The British physicist Sir James Chadwick discovered neutrons in the year 1932. He was awarded the Nobel Prize in Physics in the year 1935 for this discovery.
How were Neutrons Discovered?
- James Chadwick fired alpha radiation at beryllium sheet from a polonium source. This led to the production of an uncharged, penetrating radiation.
- This radiation was made incident on paraffin wax, a hydrocarbon having a relatively high hydrogen content.
- The protons ejected from the paraffin wax (when struck by the uncharged radiation) were observed with the help of an ionization chamber.
- The range of the liberated protons was measured and the interaction between the uncharged radiation and the atoms of several gases was studied by Chadwick.
- He concluded that the unusually penetrating radiation consisted of uncharged particles having (approximately) the same mass as a proton. These particles were later termed ‘neutrons’.
Posted by Tanu Prajapati 4 years, 11 months ago
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Santosh Narasimha Sarma Gollapudi 4 years, 11 months ago
Yogita Ingle 4 years, 11 months ago
If copper sulphate crystals are added to water then the particles of copper sulphate crystals loses attraction between them and starts moving continuously and gets mixed up with water . Water color changes to blue .
Posted by Raman Kumar Rajeev 4 years, 11 months ago
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《Aruba》°°° 《Sayed》❤ 4 years, 11 months ago
Posted by Arun Kushwah 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Diffusion: Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration down the concentration gradient.
Tissue: All living things are composed of cells, and a group of cells form tissues. These tissues combine to form organs, and the organs form an organ-system. The tissues perform simpler tasks, whereas, the organs perform the complex functions of the body. Tissues are evenly distributed throughout the body and perform specific functions in plants and animals.
Posted by Arun Kushwah 4 years, 11 months ago
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Arun Kushwah 4 years, 11 months ago
Posted by Ayush Bhati 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus.
Mass of atom =Protons +Neutrons
Since helium atom has a atomic mass of 4 u and it has two protons. Two protons contribute 2 u to atomic mass.
4u =2u +Neutrons
Neutrons =4-2 =2
Hence, it must contain 2 neutrons.
Posted by Aravintha Krishnan Varatharajan 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
The most common definition of weight is the force exerted on a body by gravity. This is often expressed in the formula W = mg, where W is the weight, m the mass of the object, and g gravitational acceleration, g=9.81 on a surface of the earth.
so if W=980N then m=W/g =1980/ 9.8=100kg
Posted by Mithilesh Kumar 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Uniform Motion:
This type of motion is defined as the motion of an object in which the object travels in a straight line and its velocity remains constant along that line as it covers equal distances in equal intervals of time, irrespective of the duration of the time.
Example of Uniform Motion:
- If the speed of a car is 10 m/s, it means that the car covers 10 meters in one second. The speed is constant in every second.
- Movement of blades of a ceiling fan.
Uniform speed: A object is said to be in uniform speed when the object covers equal distance in equal time intervals.
Posted by Mithilesh Kumar 4 years, 11 months ago
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Dhanush M 4 years, 11 months ago
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Posted by John Hatzaw 4 years, 11 months ago
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Posted by Naina Tirkey 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
The total number of electrons in a carbon atom is 6. The distribution of electrons in carbon atom is given by: First orbit or K-shell = 2 electrons
Second orbit or L-shell = 4 electrons
Or, we can write the distribution of electrons in a carbon atom as 2, 4.
The total number of electrons in a sodium atom is 11.
The distribution of electrons in sodium atom is given by:
First orbit or K-shell = 2 electrons
Second orbit or L-shell = 8 electrons
Third orbit or M-shell = 1 electron
Or, we can write distribution of electrons in a sodium atom as 2, 8, 1.
Posted by Vivek Aswal 4 years, 11 months ago
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Mohd Aman Raza Khan 4 years, 11 months ago
Posted by Vignesh Gupta 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
|
Gravitation |
Gravity |
|
1. It is the force of attraction acting between two bodies in the universe. 2. Gravitational force's formula is
3. The direction of gravitational force lies in the radial direction from the masses |
F = mg
3. The direction of the force of gravity is along the line joining the earth’s center and the center of the body. Its direction is towards the center of the earth. |
Posted by Palak Pandey 4 years, 11 months ago
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Posted by Arun Kushwah 4 years, 11 months ago
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Posted by Parth Patel 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Newton’s conclusion about the magnitude of gravitational forces is summarized symbolically as
F = Gm1m2/ r2
where,
- F is the gravitational force between bodies
- m1 is the mass of one of the objects
- m2 is the mass of the second object
- r is the distance between the centres of two objects
- G is the universal gravitational constant
The constant proportionality (G) in the above equation is known as the universal gravitation constant. The precise value of G was experimentally determined by Henry Cavendish in the century after Newton’s death. The value of G is found to be G = 6.673 x 10-11 N m2/kg2.
Posted by Mayank Shrivastav 4 years, 11 months ago
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Posted by Arun Kushwah 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
It is responsible for growth of plant. Meristematic tissue has the ability to divide and redivide to provide growth to plants.Generally, growth of plants occurs from specific region like root and shoot, nodes, girth of stem, leaf base etc. Therefore, meristematic tissue is present in these regions. Types of meristematic tissue are apical meristem, Intercalary meristem, lateral meristem.
- Apical meristem is present on root and shoot tips of the plant. This tissue divides and results in growth of stem and roots of the plant.
- Intercalary meristem is present on leaf base and nodes.
- Lateral meristem is responsible for increase in circumference i.e. girth of the stem or root of the plant.
Posted by Arun Kushwah 4 years, 11 months ago
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Tanu Prajapati 4 years, 11 months ago
Posted by Arun Kushwah 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Classification of the given substances into elements compounds and mixtures:
Elements: Sodium, Silver, Tin and Silicon.
Compounds: Calcium carbonate, Methane and carbon dioxide.
Mixtures: Soil, Sugar solution, Coal, Air, Soap and Blood.
Posted by Arun Kushwah 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Lysosomes are sphere-shaped sacs filled with hydrolytic enzymes that have the capability to break down many types of biomolecules. Lysosomes are known as suicide bags of the cell because they contain lytic enzymes capable of digesting cells and unwanted materials.
Posted by Mahi Rathod 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Endoplasmic Reticulum consist of SER (smooth endoplasmic reticulum ) & RER (rough endoplasmic reticulum )
SER helps to synthesis fats & lipids .
Whereas , RER helps to synthesis proteins .
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Santosh Narasimha Sarma Gollapudi 4 years, 11 months ago
1Thank You