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Meghna Thapar 5 years, 6 months ago
The visual ability of humans and other animals is the result of the complex interaction of light, eyes and brain. We are able to see because light from an object can move through space and reach our eyes. We see objects because they either give off their own light, or light reflects off the objects and enters our eyes. It doesn't make its own light – we can see the moon because it reflects light from the sun.
Posted by Tanish Vinita 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
- It is not possible to even walk on the road; in the absence of friction. Walking on ice is almost impossible because of lack of friction.
- Friction is necessary to keep a ladder against a wall. The ladder will not find grip against the wall in the absence of friction.
- It is very difficult to drive on a wet road because of less friction. A thin film of water is made over the surface of road. This thin film of water greatly reduces friction. Due to this, the driver finds it difficult to control the vehicle while driving on a wet road.
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Yogita Ingle 6 years, 10 months ago
Hot air is less dense than cold air and hence air pressure will exert an upwards force, in the same way air rises in water. Now if cold air was magically unaffected by gravity, then it would not be able to exert pressure on the hot air and thus it would not rise.
Posted by Kartavya Bang 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
Retrograde motion in astronomy is, in general, orbital or rotational motion of an object in the direction opposite the rotation of its primary, that is the central object . It may also describe other motions such as precession or nutation of the object's rotational axis.
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Yogita Ingle 6 years, 10 months ago
We should substitute fertilizer by organic manure because:-
1 fertilizers are harmful but organic is not.
2 organic is cheaper than fertilizers.
3 fertilizer affect health of farmer also.
Posted by Aman Kumar 6 years, 10 months ago
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Meghna Thapar 5 years, 6 months ago
Soil nutrient management is essential for sustainable biomass production and for maintaining soil quality. Organic manure increased soil pH, the concentrations of nitrogen, phosphorus, and major cations. The growth of yellow poplars by organic manure treatment is comparable to that of NPK fertilizer treatment. Organic fertilizer improves the soil by escalating the soil's ability to hold water and nutrients and decreases the erosion and soil crusting caused by rain and wind. Using organic fertilizer adds more natural nutrients, feeds important microbes in the soil and improves the structure of the soil.
Posted by Aman Kumar 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
Since sodium is a highly reactive and explosive metal ,it can't be left in open because it may react with the moisture in air and explode like a bomb.kerosene does not allow the moisture to penetrate through it .That's why sodium is stored in kerosene.
Posted by Shweta Jha 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
Tungsten melts at extremely high temperature that is 3,370°C whereas cesium has low melting point of 28.5°C. On the contrary, non-metals are usually exist in liquid or gaseous state therefore they show very low melting point such as melting point of hydrogen is -259.14 °C.
Posted by Shweta Jha 6 years, 10 months ago
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Kartavya Bang 6 years, 10 months ago
Yogita Ingle 6 years, 10 months ago
The distance from earth to any given point which is travalled at the speed of light in a period of time. One year of with travelling with the speed of light makes up one light year.
Mabiya Ali 6 years, 10 months ago
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Samayra Singh 6 years, 10 months ago
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