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Varun Banda 7 years ago
The heat spreads them out so much, they become less dense than air, which means they're light enough to be pushed up by the surrounding air pressure. But since flames are gasses, they mix with the air as it rushes in to push them upward, and the oxygen in that air is enough to keep the fire going.
Posted by Eshan Bansal 7 years ago
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Varun Banda 7 years ago
Gravity, also called gravitation, is a force that exists among all material objects in the universe. For any two objects or particles having nonzero mass, the force of gravity tends to attract them toward each other. ... Every object in the universe is surrounded by a gravitational field.
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Varun Banda 7 years ago
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force.
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Varun Banda 7 years ago
A fluid machine is a device which converts the energy stored by a fluidinto mechanical energy or vice versa . The energy stored by a fluid mass appears in the form of potential, kinetic and intermolecular energy. ...Machines using liquid (mainly water, for almost all practical purposes) are termed as hydraulic machines.
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Varun Banda 7 years ago
Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. ... Astronomical or celestial refraction causes astronomical objects to appear higher in the sky than they are in reality.
Posted by Swapnil Kudalkar 7 years ago
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Varun Banda 7 years ago
Newton’s Third Law of Motion states: ‘
To every action there is an equal and opposite reaction’.
It must be remembered that action and reaction always act on different objects. The Third Law of Motion indicates that when one object exerts a force on another object, the second object instantaneously exerts a force back on the first object. These two forces are always equal in magnitude, but opposite in direction.
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Arati Dodamani 7 years ago
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