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Sia ? 3 years ago
Measurement is the numerical quantification of the attributes of an object or event, which can be used to compare with other objects or events. The scope and application of measurement are dependent on the context and discipline.
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Gaurav Seth 3 years, 4 months ago
Moving Air is called wind. And energy produced from Wind is called Wind Energy. Wind is caused due to unequal heating of land and water bodies by the sun. This unequal heating generates air movement and causes winds to blow. This kinetic energy of wind is used to generate wind energy from a Windmill.
Posted by Swati Mishra 3 years, 4 months ago
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Gaurav Seth 3 years, 4 months ago
- The energy obtained from the sun is called solar energy
- Sun's heat which falls on the earth can be harnessed for various heating and lighting purposes.
- Most of the sun's heat is absorbed is the atmosphere.
- Only a very small portion reaches the earth and it is this energy that can be harnessed for energy purposes.
- A black surface absorbs more heat than a white surface.
- This property is used in Solar cookers, Solar water heaters and Solar cells.
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Light: Light is a form of energy which helps us in seeing objects. When light falls on an object, some of the light gets reflected. The reflected light comes to our eyes and we are able to see an object.
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Objects which are moving around us are said to be in motion whereas the objects which are not moving are said to be at rest.
Motion is classified into various types based on the path they follow.
- Rectilinear Motion – This is a motion where objects move along a straight line. Examples march past of soldiers, sprinters in race, falling stones etc.
- Circular Motion - This is a motion where objects move along a circular path. Examples hands of a clock, blades of a fan, rotation of earth around the sun etc.A type of circular motion where an object spins on its own axis, it is called rotational motion. Example rolling ball, spinning top etc.
- Periodic Motion – This is a type of motion where the object repeats its motion after a fixed interval of time. Examples pendulum of a clock, motion of child on a swing etc.
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