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Posted by Sanju Dubey 4 years, 5 months ago
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Meghna Thapar 4 years, 4 months ago
The moon's mass is 7.35 x 1022 kg, about 1.2 percent of Earth's mass. Put another way, Earth weighs 81 times more than the moon. The moon's density is 3.34 grams per cubic centimeter (3.34 g/cm3). That is about 60 percent of Earth's density. About 1.3 million Earths could fit inside the sun. The mass of the sun is 1.989 x 1030 kilograms, about 333,000 times the mass of the Earth. Knowing the mass and radius of the Earth and the distance of the Earth from the sun, we can calculate the mass of the sun (right), again by using the law of universal gravitation. ... The centripetal force is the Earth's mass times the square of its speed divided by its distance from the sun.
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Ritik Kumar 4 years, 5 months ago
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Manik Makani 4 years, 5 months ago
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Sanjay Sahani 4 years, 5 months ago
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Deep Jain 4 years, 5 months ago
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Piyush Kumarch 4 years, 5 months ago
Posted by Varnit Sharma 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
The energy of an object because of its motion or the energy gained by an object from its state of rest to motion.
What are the Examples of Kinetic Energy?
- A semi-truck travelling down the road has more kinetic energy than a car travelling at the same speed because the truck’s mass is much more than the car’s.
- A river flowing at a certain speed comprises kinetic energy as water has certain velocity and mass.
- The kinetic energy of an asteroid falling towards earth is very large.
- The kinetic energy of the aeroplane is more during the flight due to large mass and speedy velocity.
Posted by Jaspreet Kaur 4 years, 5 months ago
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Sanjay Sahani 4 years, 5 months ago
Posted by Harpreet Kaur Sandhu 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
Yes, the object instead of moving through a distance can have zero displacement. Example: If an object travels from point A and reaches to the same point A, then its displacement is zero.
Posted by Amit Yadav 4 years, 5 months ago
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Meghna Thapar 4 years, 4 months ago
- Graphical Representation of Motion:
- Distance – Time Graphs:
The change in the position of an object with time can be represented on the distance-time graph. In this graph, time is taken along the x–axis and distance is taken along the y-axis.
Distance-time graphs can be employed under various conditions where objects move with uniform speed, non-uniform speed, remain at rest etc.
When an object travels equal distances in equal intervals of time, it moves with uniform speed. This shows that the distance travelled by the object is directly proportional to time taken. Thus, for uniform speed, a graph of distance travelled against time is a straight line whereas for non-uniform speed it is a curved line.
- Velocity – Time Graphs:
The variation in velocity with time for an object moving in a straight line can be represented by a velocity-time graph. In this graph, time is represented along the x-axis and the velocity is represented along the y-axis. If the object moves at uniform velocity, the height of its velocity-time graph will not change with time. It will be a straight line parallel to the x-axis. To determine the distance moved by the car from its velocity-time graph, the area under the velocity-time graph gives the distance (magnitude of displacement) moved by the car in a given interval of time.
For example, if the car would have been moving with uniform velocity, the distance travelled by it would be represented by the area ABCD under the graph. Since the magnitude of the velocity of the car is changing due to acceleration, the distance s travelled by the car will be given by the area ABCDE under the velocity-time graph.
That is,
s = area ABCDE = area of the rectangle ABCD + area of the triangle ADE
= AB × BC + 1/2 (AD × DE)
In the case of non-uniformly accelerated motion, velocity-time graphs can have any shape.
- Equations of Motion by Graphical Method:
When an object moves along a straight line with uniform acceleration, acceleration during motion and the distance covered by it in a certain time interval by a set of equations known as the equations of motion. Three equations of motion:
i. v = u + at
ii. s = ut + ½ at2
iii. 2as = v2 – u2
where u is the initial velocity of the object which moves with uniform acceleration a for time t, v is the final velocity, and s is the distance travelled by the object in time t.
Posted by Shreeji Vakil 4 years, 5 months ago
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Meghna Thapar 4 years, 4 months ago
Variation in a species is not uncommon, but there are actually two major categories of variation in a species: continuous variation and discontinuous variation. Continuous variation is where the different types of variations are distributed on a continuum. The smallest structural and functional unit of an organism is called a cell. Cells of organisms show variation in terms of their number, shape, and size. Variations are the visible difference between a child(s) and parents. There are two types of variation: Hereditary variation: They occur due to any change in the function and structure of the gene that is inherited.
Posted by Minky Kumari 4 years, 5 months ago
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Rupali Bhandari 4 years, 5 months ago
Posted by Prem Chopade 4 years, 5 months ago
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Tenzin Choeyang 4 years, 5 months ago
Yogita Ingle 4 years, 5 months ago
The life-supporting zone of the earth where the atmosphere, the hydrosphere and the lithosphere interact and make life possible is known as the biosphere.
Posted by Ha Kaur 4 years, 5 months ago
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Posted by Ragini Amrutkar 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
A wooden table should be called a solid because it has a definite shape and volume, is rigid, does not flow, the particles are tightly bound with very less kinetic energy and, not diffuse and has negligible intermolecular spaces between its particles.
Posted by Ragini Amrutkar 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
Gas fills completely The vessel in which it is kept because the due to high kinetic energy and negligible forces of attraction the particles of a gas are moving with a speed in all directions and the gas completely filled The vessel in which it is kept..
Posted by Ragini Amrutkar 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
There remains no doubt that a rubber band is a solid.
Due to appreciable elasticity feature, it gets extended when stretched.
Also, it holds the ability to return back to its original state when relieved. Solids with appreciable elasticity hold the ability to return back to its original shape and get extended when stretched.
Posted by Sourish Nandan 4 years, 5 months ago
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Meghna Thapar 4 years, 5 months ago
The two organelles found only in plant cells are chloroplasts and central vacuoles. Mitochondria, Cell Wall, Cell membrane, Chloroplasts, Cytoplasm, Vacuole. The cell wall, chloroplasts and vacuole are found in plant cell rather than animal cells.
Posted by Dhrubojeet Dubey 4 years, 5 months ago
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Posted by Rishabh Bansal 4 years, 5 months ago
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Pravin Mishra 4 years, 5 months ago
Posted by Disha Matta 4 years, 5 months ago
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Posted by Harshal Nikalje 4 years, 5 months ago
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Paras Mehta 4 years, 5 months ago
Yogita Ingle 4 years, 5 months ago
|
Compound |
Mixture |
|
Compound are substances which are formed by chemically combining two or more elements. |
Mixtures are substances that are formed by physically mixing two or more substances. |
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Compounds are three types which are covalent compounds, metallic compounds and ionic compounds.
Note: Compounds can also be classified as organic or inorganic compounds based on the presence of carbon atom. |
Mixtures are mainly of two types i.e. homogenous mixtures and heterogeneous mixtures. |
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Compounds fall under pure substances. |
Mixtures fall under impure substances. |
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The chemical composition of compounds is always fixed. |
A mixture can have a variable composition of the substances forming it. |
Posted by Atharva Kulkarni 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
Rigidity is defined as the property exhibited by the solid to change in its shape. That is when an external force is applied to the solid material, there won’t be any change in the shape. This shows that the particles are closely packed and the attraction between these particles are very strong.
Posted by Karan Kumar 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
The dispersed phase and dispersion medium of fog respectively are liquid and gas. It is an example of liquid aerosol. Other examples of this type of aerosol include mist and clouds.
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Aman Rana 4 years, 5 months ago
1Thank You