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Kritika Trehan 8 years, 1 month ago
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".
Posted by Priyank Pathak 8 years, 1 month ago
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Kritika Trehan 8 years, 1 month ago
<i>The Newton's first law of motion states, </i>A body continues in its state of rest or of uniform motion unless acted upon by some external force. On an elementary level we can say that Conservation of momentum is required by Newton's first law of motion.
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Kritika Trehan 8 years, 1 month ago
In case of pushing a roller, if you resolve the applied force into horizontal and vertical directions, effective weight of the roller increases.
On the other hand in case of pulling force, if you resolve the applied force into horizontal and vertical direction, the effective weight of the roller decreases.
Thus, we conclude that it is easier to pull a lawn roller as compared to push it.
Posted by Ashutosh Gupta 4 years, 6 months ago
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Sia ? 4 years, 6 months ago
A motion that repeats itself again and again at regular intervals of time is called a periodic motion. All oscillatory motions are periodic motions but all periodic motions are not oscillatory. For example, the motion of the moon around the earth is periodic but not oscillatory.
A particle is said to execute simple harmonic motion if it’s acceleration is directly proportional to its displacement from the equilibrium position and is always directed towards the equilibrium position. Simple harmonic motion is a straight line motion and it requires a restoring force.
Posted by Vandana Yadav 8 years, 1 month ago
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Kritika Trehan 8 years, 1 month ago
Artificial satellites are built by people and launched by rockets into space, where they orbit around the Earth. These are some of the things that artificial satellites are used for: communications, including broadcastingtelevision programmes and relaying telephone calls.
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Varun Banda 8 years, 1 month ago
Surface energy is the work per unit area done by the force that creates the new surface. The molecules on the surface of a liquid are packed due to unbalanced inter-molecular forces than the molecules at the center. This means there is a high energy density at the surface of a liquid.
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