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Ask QuestionPosted by Harshi Singh 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Let the work done on the object against gravity = W
Work done, W = force × displacement
Work done, W = mg × h
Work done, W = mgh
Since workdone on the object is equal to mgh, an energy equal to mgh units is gained by the object . This is the potential energy (Ep) of the object.
Ep = mgh
Derivation for the equation of Kinetic Energy:
The relation connecting the initial velocity (u) and final velocity (v) of an object moving with a uniform acceleration a, and the displacement, S is
v2 - u2 = 2aS
This gives
S = (v 2 - u 2)/ 2a
We know F = ma. Thus using above equations, we can write the workdone by the force, F as
W = ma ×{ v 2 - u 2/ 2a}
or
W = 1 /2 m( v 2 - u 2 )
If object is starting from its stationary position, that is, u = 0, then
W = 1/2 m v 2
It is clear that the work done is equal to the change in the kinetic energy of an object.
If u = 0, the work done will be W = 1/2 m v 2 .
Thus, the kinetic energy possessed by an object of mass, m and moving with a uniform velocity, v is Ek = ½ mv2
Posted by Riya Kapila 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Greater the amplitude of the sound, the louder is the sound. Whereas soft sound refers to sounds having low amplitude.
Normally if we see the difference between sound and loud sound is the intensity of sound. If we look at its application the sound of a DJ may sound nice from a distance but when we go closer it becomes noise. The sound we enjoy becomes music, but that we do not enjoy becomes noise.
Posted by Shyamli Gupta 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
SARS stands for Severe Acute Respiratory Syndrome is a serious form of pneumonia caused by SARS virus .This is an acute respiratory disorder which sometimes results in the death of the patient. This is a contagious disease which starts with high fever, cough,shortness of breath and later lead to diarrhea. In severe cases it leads to heart failure, liver failure etc.
Posted by Palak Bawalia 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Bacteria are unicellular prokaryotic organisms capable of surviving in unusual habitats. Their cellular body is protected by a cell membrane as well as cell wall. The cell wall of bacteria is composed of peptidoglycan that is capable of withstanding different conditions. Some bacteria also form spores that can withstand unfavourable conditions. These spores germinate and give rise to new bacterial cells on return of favourable conditions.
Posted by Nandhana K.B 7 years, 3 months ago
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Deepak Yadav 7 years, 3 months ago
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Bindu Agarwal 7 years, 3 months ago
Osmosis is the movement of liquids along their concentration gradient hrough a semi permeable membrane.
Diffusion is the movement of gases and smaller molecules along their concentration gradient may or may not through a membrane.
Posted by Rajat Wadhwa 7 years, 3 months ago
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Karan Yadav 7 years, 3 months ago
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Anjali Rawat 7 years, 3 months ago
Mohammad Yaseen 7 years, 3 months ago
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Gaurav Kumar 7 years, 3 months ago
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Prachi Shrimali 7 years, 3 months ago
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Deepak Yadav 7 years, 3 months ago
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Posted by Abhishak Choudhary 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Sound waves are longitudinal waves. When a sound wave passes through a medium, such as air, the individual particles of the medium move in a direction parallel to the direction of propagation of the disturbance. The particles of the medium thus move to and fro along the direction of propagation of the sound waves.
Posted by Deepak Kaushik 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
The two forms of oxygen found in the atmosphere are:
(i) Elemental oxygen is normally found in the form of diatomic molecule (O2) in the lower part of atmosphere. It is about 21% in the air and non-poisonous.
(ii) Ozone is found in the stratophere part of atmosphere. It contains three atoms of oxygen (O3). It is the poisonous form of oxygen.
(iii) Some other forms of oxygen are also found in the combined state. In Earth's crust, it is found as the oxides of most metals and silicon and also as carbonate, sulphate, nitrate and other minerals. In other forms, it is the part of biological molecules like carbohydrates, proteins, fats and nucleic acids, etc.
Posted by Deepak Kaushik 7 years, 3 months ago
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Akshata Laddha 7 years, 3 months ago
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Gungun Tyagi 7 years, 3 months ago
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