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Posted by Bhavesh B Nair 4 years, 11 months ago
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Yogita Ingle 5 years ago
The second law of motion describes what happens to the massive body when acted upon by an external force. The law states that the force acting on the body is equal to the product of its mass and acceleration.
When a constant force acts on a body, the forces result in the acceleration of the body. However, if the object is already in motion, or if this situation is viewed from a moving frame of reference, the body might appear to speed up or slow down or change its direction depending on the direction of the force.
Mathematically, we express the law as follows:
P = df/dt
⇒f ∝ (mv−mu)/t
⇒f∝m(v−u)/t
⇒f ∝ ma
⇒f = kma
Where k is the constant of proportionality and it comes out to be 1 when the values are taken in SI unit. Hence the final expression will be,
F=ma
Posted by Kiran Devi 5 years ago
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Yogita Ingle 5 years ago
| Basis | Acid | Base |
| Definition | An acid is any chemical compound once dissolved in water produces a solution with hydrogen ion activity more than purified water | A base is an aqueous substance that could absorb hydrogen ions. |
| Strength | Relies on the concentration of the hydronium ions | Relies on the concentration of the hydroxide ions |
| Examples | Acetic acid CH3COOH and sulphuric acid | Sodium Hydroxide (NaOH) and Ammonia |
| Characteristics (Physical) | Would depend upon the temperature acids would look solid, liquid or in the form of gas. It would also have a sour taste. | Bases would feel slippery and solid in nature (except for ammonia, which is gaseous). It would have a bitter taste. |
| Disassociation | Acids would release hydrogen ions (h+) when mixed with water | Bases would release hydroxide ions(OH-) when mixed with water |
| Test with Litmus | Would turn litmus paper red | Would turn litmus paper blue |
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Suhani Singh 5 years ago
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Yogita Ingle 5 years ago
Ciliated Epithelium – When the columnar epithelial tissues have cilia, then they are ciliated epithelium. They are present in the lining of the trachea, kidney tubules, etc. The rhythmic movement of the cilia helps in the movement of material in one direction.
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Renee Judiana 5 years ago
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Yogita Ingle 5 years ago
Acceleration due to gravity is the acceleration that is gained by an object due to the gravitational force. Its SI unit is ms². It has a magnitude as well as direction. Thus it is a vector quantity.
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Suhani Singh 5 years ago
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Gaurav Seth 5 years ago
Echinodermata(Spiny skinned animals)
1)They are star like,spherical or elongated. 2)Body is triploblastic,coelomate,unsegmented,radially symmetrical. 3)Body lacks heads but has oral surfaces. 4)The body w 4)The body wall is co all is covered by spiny hard calcium carbonate plates forming a rigid y hard calcium carbonate plates forming a rigid endoskeleton. 5)Excretory organs absent. 6)Sexes are separate. 7)Reproduction is asexual and sexual. 8)They have a peculiar vascular system that they use for moving. For Ex:Starfish,Echinus,sea cucumber.
Protochordata
1)Animals are bilaterally symmetrical, triploblastic, have coelom. 2)They show a feature of body design named notochord. 3)They do not have proper notochord at all stages of their lives. 4)They are marine animals. For Ex: Balanoglossus, herdemania, amphioxus.
Gaurav Seth 5 years ago
Platyhelminthes
- The organisms belonging to this group are complexly designed.
- The body of these organisms has bilaterally symmetrical shape. This means that the design of the left and the right halves of the body are alike.
- These organisms have three layers of cells that makes up differentiated tissues due to which such animals are called triploblastic.
- These organisms have no true internal body cavity or coelom.
Nematode 1)The organism have bilaterally symmetrical and triploblastic body. 2)Body is cylindrical rather than flattened. 3)Body has tissues but no real organs. 4)Parasitic nematodes are pathogenic means they produce diseases in host. 5)For Ex:Roundworm lives in human intestine and cause ascariasis. 6)Sexes are separate. 7)Alimentary canal is straight,complete mouth and ****. For Ex: Ascaris,pinworm,hookworm.
Mollusca 1)Body is soft,bilaterally symmetrical,segmented. 2)Circulatory system is open. 3)The coelomic cavity is blood filled and reduced. 4)They have kidney like organs for excretion. 5)Sexes are usually separate. 6)There is little segmentation. 7)They is a foot that is used for moving around. 8)They are aquatic and some are terrestrial. For Ex:Chiton,pila,Unio
Posted by Chitralekha Khaund 5 years ago
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Yogita Ingle 5 years ago
Glandular Epithelium – These are modified columnar epithelial tissues. They are large cells that present in the tear glands, sweat glands etc. Their main function is secretion.
Alok Gupta 5 years ago
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Yogita Ingle 5 years ago
True solution
(i) A true solution is a homogeneous mixture of two or more than two substances.
(ii) In a true solution, solute cannot be seen even with a microscope.
(iii) In a true solution, the size of particles is about 10-10 m.
(iv) The constituents of a true solution cannot be separated by filtration.
Colloid
(i) A colloid is a homogeneous-looking, but heterogeneous-mixture.
(ii) In a colloid, the particles can be seen only with a powerful microscope.
(iii) In a colloid, the size of particle is between 10-7 10-9 m.
(iv) The constituents of a colloid cannot be separated by filtration.
Posted by Abhishek Ladda 5 years ago
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Dwanish Shetty{Ronaldo} 5 years ago
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Yogita Ingle 5 years ago
1 watt power is defined as the power produced when 1 Joule of work is done for 1 second.
Posted by Arya M 5 years ago
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Yogita Ingle 5 years ago
The branch of agriculture that focuses upon the proper feeding, shelter, health and breeding of the domestic animals is called animal husbandry.
To meet the growing the demand for food (milk, egg, meat, fish) with the growing population animal husbandry is necessary.
Abhishek Ladda 5 years ago
Posted by Manya Puri 5 years ago
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Gaurav Seth 5 years ago
Cells have different shapes because they do different things. Animal cells come in many different shapes and sizes. The shapes of cells have evolved to help them carry out their specific function in the body, so looking at a cell's shape can give clues about what it does.
Posted by Laaibiang Mawlong 5 years ago
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Yogita Ingle 5 years ago
As the body is moving in constant acceleration, the motion of the body is linear.
If the body starts from rest means its initial velocity is zero which is represented mathematically as u = 0.
The acceleration is constant i.e. and the time covered will be t = 2s.
So provided the data’s such as initial velocity, acceleration and time covered given, the distance covered in 2s can be calculated using the Newton’s third equation of motion, i.e.,
s= ut + 1/2at2 ........ (I)
By substituting the known values in (1), we get
x = 0(2) + 1/2 (10) (2) (2)
x = 20m
Thus, the distance covered by the body in 2s is 20 meters.
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