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Ask QuestionPosted by Sourabh Singh 4 years, 6 months ago
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Posted by Sourabh Singh 4 years, 6 months ago
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Meghna Thapar 4 years, 6 months ago
The speed of water range from 1450 to 1498 meters per second in distilled water and 1531 m/s in sea water at room temperatures (20 to 25 °C).
Posted by Milrose Manoj 4 years, 6 months ago
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Ayushman Panda 4 years, 6 months ago
Golu Sharma 4 years, 6 months ago
Posted by Ujjwal Singh 4 years, 6 months ago
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Ayushman Panda 4 years, 6 months ago
Posted by Mohit Singh 4 years, 6 months ago
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Meenal Khandelwal 4 years, 6 months ago
Yogita Ingle 4 years, 6 months ago
Cells are called the structural and functional unit of life because all the living organisms are made up of cells and all the functions that take place inside the organisms are performed by cells.
Posted by Sejal Parmar 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
The sky appears blue when viewed from Earth because of scattering of light particles I.e blue light gets refracted wherever there is atmosphere. As there is no atmosphere in space, astronauts see the actual colour of sky I.e black.
Posted by Himanshu Sharma 4 years, 6 months ago
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Shubh Varshney 4 years, 6 months ago
Posted by Divyanshu Tiwari 4 years, 6 months ago
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Priyanshu Bhardwaaj 4 years, 6 months ago
Posted by Annesha Mazumder 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
Distance covered by the satellite in 24 hours
s=2πr
= 2 × 3.14 × 42250 = 265464.58 km
Therefore speed of satellite,
v = distance travelled/ time taken = 265464.58/ 24×60×60 =3.07 km s−1
Posted by Angel Gautam Av 2124 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
Diffusion is the net movement of molecules of a substance from a region of their higher concentration to a region of their lower concentration. Net movement means there are more molecules moving in one direction than in the opposite direction.
Posted by Shivkumar Balikai Shivkumar Balikai 4 years, 6 months ago
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Posted by Nikunj Varun 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
|
Scalar Quantity |
Vector Quantity |
| It has magnitude only | It has magnitude as well as the direction |
| It does not have direction | It has direction |
| It is specified by a number and a unit | It is also specified by a number along with the direction and unit |
| It is represented by quantity symbol | It is represented by quantity symbol in bold or with the arrow sign above |
| Example: Temperature, speed, etc | Example: Acceleration, velocity, etc |
Diksha? 4 years, 6 months ago
Posted by Nikunj Varun 4 years, 6 months ago
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Kareena Kumari Choubey 4 years, 6 months ago
Diksha? 4 years, 6 months ago
Posted by Nikunj Varun 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
An object is said to be in motion if it changes its position with respect time and observer.
An object is said to be at rest if it does not changes its position with respect time and observer.
MOTION AND REST ARE RELATIVE TERMS.
That means it all depends upon the observer who is observing the object.
Example:
1. A person standing in a moving bus is at rest with respect to bus and is in motion with respect to observer on the ground.
2. A girl swinging in garden is in motion with respect to persons moving in garden and at rest with respect to swing.
Posted by Smit Tandel 4 years, 6 months ago
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Posted by Rohit Malik 4 years, 6 months ago
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Posted by Naina Choudhary. 4 years, 6 months ago
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Meghna Thapar 4 years, 6 months ago
Plastids occur in most plant cells. They are of three types: Chromoplasts, chloroplasts and leucoplasts. Chloroplasts are important for photosynthesis in plants. They also contain various yellow or orange pigments in addition to chlorophyll. Leucoplasts store materials such as starch, oils and protein granules.
Posted by Naina Choudhary. 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
Functions
- They are involved in synthesis of cell wall,plasma membrane and lysosomes.
- It produces vacuoles which contain cellular secretions eg:enzymes,protein,cellulose etc.
- They act as an area for storage,processing and packaging of various cellular secretions.
Posted by Naina Choudhary. 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
Protoplasm is the content of a cell that is surrounded by the cell membrane. It includes cytoplasm and nucleoplasm. It is composed of a mixture of macromolecules like ions, amino acids, monosaccharides, macromolecules like nucleic acids, proteins, lipids and polysaccharides, water and inorganic salts.
Posted by Palak Gupta 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
Mitochondria are known as the powerhouses of the cell. The energy required for various chemical activities needed for life is released by mitochondria in the form of ATP (Adenosine triphosphate) molecules. ATP is known as the energy currency of the cell. The body uses energy stored in ATP for making new chemical compounds and for mechanical work. Mitochondria are strange organelles in the sense that they have their own DNA and ribosomes. Therefore, mitochondria are able to make some of their own proteins.
Posted by Palak Gupta 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
Mitochondria and plastids are semi-autonomous as they are only partially dependent on the cell to replicate and grow as they have their own DNA. They have their own ribosomes to make proteins.
Posted by Lamha Verma 4 years, 6 months ago
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Brishti Brishu 4 years, 6 months ago
Posted by Ishika Awasthi 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
Time to reach Maximum height ,
t = 6/2 = 3 s.
v = 0 (at the maximum height )
a = - 9.8 m s-²
a) Using, v = u + at, we get
0 = u - 9.8 × 3
or, u = 29.4 ms-¹
Thus, the velocity with which it was thrown up = 29.4ms-¹
b) Using, 2aS = v² - u², we get
S = v²- u²/2a
= 0 - 29.4 × 29.4/- 2× 9.8
= 44.1 m
Thus, Maximum height it reaches = 44.1 m.
c) Here, t = 4s. In 3 s, the ball reaches the maximum height and in 1 s it falls from the top.
Distance covered in 1 s from maximum height,
S = ut + 1/2at ²
= 0 + 1/2 × 9.8 × 1
= 4.9 m
Therefore, The ball will be 4.9 m below the top of the tower after 4 s.
Posted by Shubham Raj 4 years, 6 months ago
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Posted by Adarsh Singh 4 years, 6 months ago
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Meghna Thapar 4 years, 4 months ago
The third law of motion states that when one object exerts a force on another object, the second object instantaneously exerts a force back on the first. These two forces are always equal in magnitude but opposite in direction. The two opposing forces are also known as action and reaction forces.
Example of third law of motion:
- When a gun is fired, it exerts a forward force on the bullet. The bullet exerts an equal and opposite reaction force on the gun. This results in the recoil of the gun. Since the gun has a much greater mass than the bullet, the acceleration of the gun is much less than the acceleration of the bullet.
- As the sailor jumps forward out of a rowing boat, the force on the boat moves it backwards.
Posted by Rinki Ritesh 4 years, 6 months ago
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Sneha Anand 4 years, 6 months ago
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Posted by Shivam Tiwari 4 years, 6 months ago
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Sneha Anand 4 years, 6 months ago
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Posted by Asha Devi 4 years, 6 months ago
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Yogita Ingle 4 years, 6 months ago
Amphibians are those organisms which live on both land and in water. Bryophytes are called amphibians of the plant kingdom because these plants though live in soil but they need water for sexual reproduction. The sperm of bryophyte (antherozoids) are flagellate and need water to swim to the eggs. In other words, as these plants need water for reproduction unlike other plants, they are called as amphibians.
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