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Ask QuestionPosted by Aparna Singh 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
Given, Initial velocity, u = 0
Final velocity, v =?
Acceleration, a = 4 cm/s2
And, Time, t = 10 s
We know that,
v = u + <i>a</i>t
= 0 + 4 × 10
= 40 cm/s
Therefore, after 10 seconds the velocity of trolley will be 40 cm/s.
Posted by Arslaan Khan 4 years, 4 months ago
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Posted by Ankit Yadav 4 years, 4 months ago
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Kavya Sharma 4 years, 4 months ago
Posted by Kashmir Singh 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
Evaporation produces cooling. This is based on the fact that when a liquid evaporates, it takes (or draws) the latent heat of vaporization from 'another matter' which it touches. This 'another matter' looses heat and gets cooled. Therefore, evaporation causes cooling.
Posted by Kishore Sakthivel 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
Plasma have no fix or net charge , plasma is electrically neutral , soo the overall or whole charge of plasma is roughly zero .
Posted by Abhinav Rana 4 years, 4 months ago
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Kavya Sharma 4 years, 4 months ago
Posted by Kishore Sakthivel 4 years, 4 months ago
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Posted by Trishita Chakraborty 4 years, 4 months ago
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Kavya Sharma 4 years, 4 months ago
Shivam Yadav 4 years, 4 months ago
Posted by Piyush Raheja 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
A tea strainer is used to catch loose tea leaves at the time of pouring the solution in the jug.
The same is not at all possible in case of muddy water.
Beng a partly homogeneous solution, it will pass through the strainer in the impure form thus making it difficult to obtain a crystal clear solution.
Pallavi Joshi 4 years, 4 months ago
Posted by Om Parkash 4 years, 4 months ago
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Kavya Sharma 4 years, 4 months ago
Pallavi Joshi 4 years, 4 months ago
Yogita Ingle 4 years, 4 months ago
The matter is made up of very tiny particles and these particles are so small that we cannot see them with naked eyes.
Following are the basic three states of matter:
- Solid
- Liquid
- Gas
Posted by Theertha S 4 years, 4 months ago
- 4 answers
Yogita Ingle 4 years, 4 months ago
The important characteristics of particles of matter are the following:
- The particles of matter are very, very small.
- The particles of matter have space between them.
- The particles of matter are constantly moving.
- The particles of matter attract each other.
Posted by Jaivardhan Singh Rathore 4 years, 4 months ago
- 2 answers
Kavya Sharma 4 years, 4 months ago
Yogita Ingle 4 years, 4 months ago
Osmosis is a process by which the molecules of a solvent pass from a solution of low concentration to a solution of high concentration through a semi-permeable membrane.
Posted by Priya Rani 4 years, 4 months ago
- 1 answers
Meghna Thapar 4 years, 4 months ago
As the wavelength of an electron can be up to 100,000 times shorter than that of visible light photons, electron microscopes have a higher resolving power than light microscopes and can reveal the structure of smaller objects. Electron microscopes have certain advantages over optical microscopes: The biggest advantage is that they have a higher resolution and are therefore also able of a higher magnification (up to 2 million times). Light microscopes can show a useful magnification only up to 1000-2000 times.
Posted by Sayema :) 4 years, 4 months ago
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Meghna Thapar 4 years, 4 months ago
- Every living organism is unique and this uniqueness is the basis of the vast diversity displayed by the organisms in our world.
- Different characteristics are used to determine the hierarchy of classification.
- Charles Darwin first described the idea of evolution in 1859 in his book, The Origin of Species.
- Prokaryotic or eukaryotic cell organization is the primary characteristic of classification, since this feature influences every detail of cell design and capacity to undertake specialized functions.
- The evolution of organisms greatly determines their classification.
- Older organisms are also referred to as 'primitive or lower organisms' whereas the younger organisms are also referred to as 'advanced or higher organisms'.
- The diversity of life forms found in a region is biodiversity.
- Aristotle classified organisms depending on their habitat.
- Robert Whittaker proposed the five-kingdom scheme of classification, based on the cell structure, nutrition and body organization of the organisms.
- The five kingdoms proposed by Whittaker are Monera, Protista, Fungi, Plantae and Animalia. Carl Woese further divided Monera into Archaebacteria and Eubacteria.
- Prokaryotic one-celled organisms such as bacteria, cyanobacteria and mycoplasma are included in Monera.
- Lichens are symbiotic associations of certain fungi with blue green algae.
- The important divisions of Plantae are Thallophyta, Bryophyta, Pteridophyta, Gymnospermae and Angiospermae.
- Thallophytes, Bryophytes and Pteridophytes possess inconspicuous reproductive organs and are called Cryptogams. Gymnosperms and Angiosperms are grouped under Phanerogamae, since they possess well-differentiated, seed producing reproductive tissues.
- Bryophytes, such as moss and <i>Riccia</i>, show differentiated plant body lacking true vascular tissues.
- Monocotyledon plants possess seeds with single cotyledon whereas dicots are plants with two cotyledons in the seeds.
- Organisms grouped under Animalia are eukaryotic, multicellular, heterotrophic and lack cell wall.
- Vertebrates and Protochordates are grouped under Chordata.
- The five classes of vertebrates are Pisces, Amphibia, Reptilia, Aves and Mammalia.
- The system of scientific naming or nomenclature we use today was introduced by Carolus Linnaeus in the eighteenth century.
Posted by Aarav Chauhan 4 years, 4 months ago
- 1 answers
Yogita Ingle 4 years, 4 months ago
Instantaneous speed is the speed of a body at a given point and average speed is the summation of speeds at all the points divided by total time. Therefore, instantaneous speed and average speed can be equal only when body is moving with a uniform speed.
Posted by Bhoomi Gupta 4 years, 4 months ago
- 1 answers
Yogita Ingle 4 years, 4 months ago
Vacular tissue is the supporting and conducting tissue in plants, consisting of xylem and phloem. This tissue conducts water and nutrients through the plant body in higher plants.A vascular bundle is a part of the transport system in vascular plants. Vascular bundle is a unit strand of the vascular system in stems and leaves of higher plants, consisting essentially of xylem and phloem. Usually vascular bundle has phloem on the outside and xylem on the inside.
Posted by Minakshi Panda 4 years, 4 months ago
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Pratik Kaul 4 years, 4 months ago
Yogita Ingle 4 years, 4 months ago
Animals do not have rigid walls because cell walls are incompatible with the way in which an animal moves and grow. The flaccid cell membrane provides the animal cell freedom of mobility and formation of different tissues which is not present in plants.
Posted by Jigyasha Kumari 4 years, 4 months ago
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Minakshi Panda 4 years, 4 months ago
Posted by Swagat Dandasana 4 years, 4 months ago
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Posted by Kajal Kumari 4 years, 4 months ago
- 3 answers
Rajat Singh 4 years, 4 months ago
Rajat Singh 4 years, 4 months ago
Rajat Singh 4 years, 4 months ago
Posted by Aparna Singh 4 years, 4 months ago
- 1 answers
Yogita Ingle 4 years, 4 months ago
Initial Velocity=u=0m/s
Final velocity= V= 72km/h
Time =5 min =5/60 h =1/12 h
acceleration=a=?
As we know that , a=v-u/t
⇒a=72-0/1/12
=72*12
=864km/h²
Distance travelled =s=ut+1/2at²
=0x1/12 +1/2(864)(1/12)²
=(1/2)x864x(1/144)
=3km
∴Distance travelled by the train for attaining this velocity 3km.
Posted by Aparna Singh 4 years, 4 months ago
- 1 answers
Yogita Ingle 4 years, 4 months ago
To find the height attained,
v2 = u2 + 2as
s = Height attained = (v2 - u2)/2a = (0 - 25)/(2 x -10) = 1.25 .
a is negative since it's direction is opposite to the direction of motion.
t = (v - u)/a = -5/-10 = 0.5 s.
Posted by Aparna Singh 4 years, 4 months ago
- 1 answers
Yogita Ingle 4 years, 4 months ago
Here initial velocity=u
final velocity=v
acceleration=a
time=t
u=0
a=4
t=10
use the first equation of motion i.e -v=u+at
v=0+40
v=40m/s
now use third equation of motion i.e{tex}-2as=v^2-u^2{/tex}
2*4*s=160
0s+1600/8=200m
Posted by Alfred Parvez Ullah 4 years, 4 months ago
- 1 answers
Yogita Ingle 4 years, 4 months ago
Cutin is a waxy water-repellent substance in the cuticle of plants, consisting of highly polymerized esters of fatty acids.
They help desert plants retain moisture over long periods of time.
Posted by Ramesh Mallick 4 years, 4 months ago
- 1 answers
Yogita Ingle 4 years, 4 months ago
Elements having same atomic number but different atomic masses are known as Isotopes.
Example:
Carbon-12, Carbon-13, Carbon-14 are thee isotopes of carbon atom. Here 12, 13 and 14 are the atomic masses of isotopes of carbon respectively. Since, atomic number is the unique property of an atom, thus the atomic number of carbon is 6 even in the case of three types of carbon (isotopes)
126Carbon, 136Carbon, 146Carbon,
Hydrogen-1, Deuterium–2, Tritium-3 are three isotopes of hydrogen.
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Yogita Ingle 4 years, 4 months ago
Displacement is the shortest distance possible between initial and final position.
As the athlete is in circular motion , displacement is zero. [ THis is because , the initial and final position is the same ]
Distance covered in 1 round = Circumference of the circle
Circumference of the circle = 2πr
Diameter = 200 m
Radius = 100 m
Distance covered in 1 round[ 40 sec ] = 2 × 22/7 × 100 = 628.57 m
Distance covered in 1 sec = 628.57 ÷ 40 = 15.71 m
2min 20 sec = 140 sec
Distance covered in 140 sec = 15.71 × 140 = 2199.4 m
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