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Yogita Ingle 5 years, 5 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 5 years, 5 months ago
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Yogita Ingle 5 years, 5 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.
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Posted by Nikunj Varun 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
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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? 5 years, 5 months ago
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Diksha? 5 years, 5 months ago
Posted by Nikunj Varun 5 years, 5 months ago
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Yogita Ingle 5 years, 5 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.
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Posted by Naina Choudhary. 5 years, 5 months ago
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Meghna Thapar 5 years, 5 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. 5 years, 5 months ago
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Yogita Ingle 5 years, 5 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. 5 years, 5 months ago
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Yogita Ingle 5 years, 5 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 5 years, 5 months ago
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Yogita Ingle 5 years, 5 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 5 years, 5 months ago
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Yogita Ingle 5 years, 5 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 5 years, 5 months ago
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Brishti Brishu 5 years, 5 months ago
Posted by Ishika Awasthi 5 years, 5 months ago
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Yogita Ingle 5 years, 5 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 5 years, 5 months ago
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Meghna Thapar 5 years, 3 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.
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Meghna Thapar 5 years, 5 months ago
A group of cells that are similar in structure and work together to do a peculiar function is called tissue.
Deepak Kumar 5 years, 5 months ago
Yogita Ingle 5 years, 5 months ago
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Plant Cell |
Animal Cell |
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Posted by Ayush Kalyan 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Endoplasmic reticulum
- The large network of membranous sheets and tubes is called endoplasmic reticulum.
- They are filled with fluids and carries materials throughout the cell due to which it is also called transport system of the cell.
- It transports materials between the regions of cytoplasm or between the cytoplasm and nucleus.
- It also provides a surface for some biochemical activities of cell.
It can be classified into two types:
- RER (Rough Endoplasmic Reticulum)
- SER (Smooth Endoplasmic Reticulum)
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Posted by Amrita Kushwaha 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Five causes of deforestation in India during the British rule were:
a. The British considered forests as wildernesses which must be brought under cultivation to enhance the income of the state. Thus, large tracts of forest lands were cleared for cultivating land.
b. Due to high demand, forests in Britain were dissapearing. This created a problem for British Royal navy as wood as required to build ships. The British started exploring Indian forests on a massive scale.
c. Forests were destroyed to supply sleepers for railways and to further expand areas under railways.
d. The colonial government thought forests as unproductive and hence cleared them for building dams and layingdown cities.
e. Cash crops were expected to bring huge revenues. So large areas of natural forests were cleared to make way for tea, coffee and rubber plantations.
Posted by Amrita Kushwaha 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
The council of ministers consists of all three catogries of monisters . They are cabinet Minister , minister of state and deputy minister. The cabinet minister is the head of his ministry . There cannot be more than one cabinet minister in any ministry.It is also to be remembered that a ministry may or may not have a cabinet minister.
Posted by Vikas Kumar 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
The reaction in which a compound splits up into two or more simpler substance called as decomposition reaction.
When decomposition reaction is carried out by light then it is called photochemical decomposition
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Yogita Ingle 5 years, 5 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.
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