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Ask QuestionPosted by Dipti Patel 4 years, 3 months ago
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Posted by K.Kumar Raunak 4 years, 3 months ago
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Yogita Ingle 4 years, 3 months ago
Diffusion in gas:
Diffusion takes place most rapidly in gasses.
The particles of gas have more kinetic energy due to that they move with high speed. Because of the movement of particles with high speed gas diffuses most rapidly.
Example: Mixing of gases in air
Diffusion in liquid:
Diffusion takes place in liquids. The rate of diffusion is less in liquid than that of gases.
The particles of liquid have enough movement because of kinetic energy for diffusion. When two liquids are kept together they are mixed because of the diffusion.
For example; When salt solution is kept in water this makes whole the solution salty after some time. This happens because of diffusion in liquids.
Diffusion in solid:
Diffusion takes place with slowest rate in the case of solids. The rate of diffusion is almost negligible in solids.
Since the particles of solid have lowest kinetic energy so they do not move. Hence, diffusion takes a long time in the case of solid.
Example – Some time we observe that the marks of chalk on the black board could not be wiped out easily after a long time. This happens because of the diffusion of particles of chalks with the particles of black-board and marks of chalk could not be wiped out.
Posted by Insha Fatima 4 years, 3 months ago
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Meghna Thapar 4 years, 3 months ago
The ribosomes are the sites of protein manufacture. The SER helps in the manufacture of fat molecules or lipids. Some of these proteins and lipids help in building the cell membrane. This process is known as membrane biogenesis. Some other proteins and lipids function as enzymes and hormones.
Posted by Free Fire Gamer Ankush 4 years, 3 months ago
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Shakti Chaturvedi 4 years, 3 months ago
Posted by Madhav Grover 4 years, 3 months ago
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Meghna Thapar 4 years, 3 months ago
Impulse = change in linear momentum .
Initial momentum of ball= mu
=0.15 × 12 =1.8 kg.m/sec
Final momentum of ball = -mu
= - 0.15 × 12 = -1.8 kgm/sec
Change in momentum of ball =final -initial
= -1.8 -1.8 = -3.6 kgm/sec
So,
Change in momentum of bat = -change in momentum of ball
Change in momentum of bat =3.6 kgm/s
Impulse imparted to ball =change in momentum of bat = 3.6 kgm/s
Posted by Raj Kumar 4 years, 3 months ago
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Yogita Ingle 4 years, 3 months ago
Simple distillation is the process of separating components of mixture containing two miscible liquids that boil without decomposition and have sufficient difference in their boiling points
Posted by Tanupriya Bhagat 4 years, 3 months ago
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Master Knowledge Source 4 years, 3 months ago
Shakti Chaturvedi 4 years, 3 months ago
Ananya Gaur 4 years, 3 months ago
Yogita Ingle 4 years, 3 months ago
- As the object covers equal distances in equal intervals of time, it is said to be in uniform motion.
Example- Motion of planets around Sun, they revolve at a constant speed. So the distance travelled in every equal time period is equal
Priyanshu Kumar 4 years, 3 months ago
Posted by Chirag Dahiya 4 years, 3 months ago
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Posted by Chirag Dahiya 4 years, 3 months ago
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Posted by Arjun Singh 4 years, 4 months ago
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Madhav Grover 4 years, 3 months ago
Meghna Thapar 4 years, 4 months ago
If it has an initial velocity u, and it accelerates, at a constant rate a, to a velocity v, in t seconds, then, by Newton's Second Law, F = ma. But since a = (v-u)/t, F = m (v - u)/t or F = (mv - mu)/t. This is saying that the force is equal to the rate of change of momentum, where momentum = mass x velocity. The first equation states that a Force is equal to Mass times Acceleration, or Newton's second law of motion. The second one states that Momentum (P) is equal to Mass times Velocity. This means that a force is the rate at which an object's momentum is changing over time.
Posted by Sayani Biswas 4 years, 4 months ago
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Meghna Thapar 4 years, 4 months ago
Most fungi reproduce by releasing tiny spores that then germinate (sprout) and grow into a new fungus. The spores are produced by, and released from, a fruiting body that is visible above the ground. Some fungi drop spores, which are blown away by the wind. Spores are products of both sexual and asexual reproduction and act as the prime units of dispersal in fungi. Most spores that settle on an appropriate substrate under favourable environmental conditions germinate to produce one or more germ tubes and a new fungal mycelium.
Posted by Hutoli Yeptho 4 years, 4 months ago
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Posted by Rani Singh 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
let us demonstrate the sublimation by taking the example of Ammonium chloride.
In China dish , Take a Small amount of the Substance. The dish is covered by a perforated sheet. A glass funnel in the inverted position is placed over the dish so as to cover it. The steam of the funnel is plugged with cotton. The dish is heated from below.
As a result, ammonium chloride undergoes sublimation i.e :- it changes into vapours which pass through the holes or perforations of the perforated sheet. The vapours get cooled in the upper portion of the funnel and change to the solid form. The latter gets deposited on the inner walls of the funnel and can be suitably removed later on. The cotton plug does not allow any vapours of the Substance to escape.
Posted by Riddhima Sharma 4 years, 4 months ago
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Gaurav Seth 4 years, 4 months ago
Smooth endoplasmic reticulum in liver cells of vertebrates helps in detoxification. It metabolises various toxic or poisonous substances such as drugs, aspirin, insecticides (DDT), petroleum products and pollutants. These toxic substances make their entry in animal’s body through food, air or water.
Posted by Rashmi Mali 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
Physical changes are reversible in nature and occur when the bonds are rearranged or the forces of intermolecular attraction change with the application or heat or pressure, etc. New bonds are not formed during a physical change.
Posted by Anjali Niware 4 years, 4 months ago
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Chirag Dahiya 4 years, 3 months ago
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Lakshya Hooda 4 years, 4 months ago
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Ayush Sharma 4 years, 4 months ago
Lakshya Hooda 4 years, 4 months ago
Posted by Fauziya I M 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
Following are the basic three states of matter:
- Solid
- Liquid
- Gas
Apart from the above mentioned three, there are 2 more states of matter which we do not see in our everyday life. They are Plasma & Bose-einstein condensate.
Posted by Bhumika Rao 4 years, 4 months ago
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Posted by Mishty Panchal 4 years, 4 months ago
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Tanishq Daiya 4 years, 4 months ago
Posted by Mishty Panchal 4 years, 4 months ago
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Tanishq Daiya 4 years, 4 months ago
Meghna Thapar 4 years, 4 months ago
In the centre of a black hole is a gravitational singularity, a one-dimensional point which contains infinite mass in an infinitely small space, where gravity become infinite and space-time curves infinitely, and where the laws of physics as we know them cease to operate. The gravitational pull of the black hole is so strong that, in order to escape it, an object would have to be moving faster than the speed of light.
Posted by Mishty Panchal 4 years, 4 months ago
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Shakti Chaturvedi 4 years, 3 months ago
Posted by Mishty Panchal 4 years, 4 months ago
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Meghna Thapar 4 years, 4 months ago
The fertility rate due to the population policies and other measures has been falling but even then it is much higher compared to other countries. This means that the birth rate has been falling, but with rapid progress in medical sciences, the death rate has fallen which has ensured that the population grows.
Decreasing child mortality, improving education and providing people with economic opportunities all help to reduce fertility and population growth. International aid, fair trade and global justice are all tools to help bring global population back to sustainable levels.
Posted by Mishty Panchal 4 years, 4 months ago
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Diksha Panchal 4 years, 4 months ago
Posted by Mishty Panchal 4 years, 4 months ago
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Meghna Thapar 4 years, 3 months ago
From the velocity-time graph, the distance s travelled by the object in time t, moving under uniform acceleration a is given by the area enclosed within the trapezium OABC under the graph. That is,
s = area of the trapezium OABC = (OA + BC) X OC/2
Substituting OA = u, BC = v and OC = t,
We get
s= (u+v) t/2
From the velocity-time relation
We get
t= v - u/a
We have
s = (v + u) x (v – u)/2a
or 2as = v2 – u2
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