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Gaurav Seth 6 years, 2 months ago
On September 11, 2001, 19 militants linked with the Islamic extremist group al-Qaeda hijacked four airplanes and carried out suicide attacks against targets in the United States. Two of the planes were flown into the twin towers of the World Trade Center in New York City, which destroyed the towers completely. The third plane hit the Pentagon just outside Washington, D.C., and the fourth plane crashed in a field in Pennsylvania. According to various sources about 3,000 people were killed during these attacks. These attacks made terrorism a global problem and has posed threat to global security.
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Yogita Ingle 6 years, 2 months ago
When an object changes its position with elapse of time in respect to a stationary object, such as a building, electric pole, etc., the object is said to be in motion.
Posted by Gokul Jadhav 6 years, 2 months ago
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Yogita Ingle 6 years, 2 months ago
Gravitation is the force of attraction between any two bodies. All the objects in the universe attract each other with a certain amount of force, but in most of the cases, the force is too weak to be observed due to the very large distance of separation. This force of attraction was first observed by Sir Isaac Newton and was presented as Newton’s law of gravitation in the year 1680.
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Yogita Ingle 6 years, 2 months ago
Van de graaff generator is used to generate high voltages of the order of a few million volts. This results in generation of large electric fields for experimental purposes.
Principle
- The inner sphere has a higher potential than outer if the charge q is positive.
- If the two spheres are connected through a wire, the charge will flow from high to low potential.
- Thus, providing smaller potentials at the inner sphere will keep building large amount of charge at the outer sphere, till the breakdown field of air (3 x 106 V/m) is reached.
- This accumulates close to millions of volts.
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Jatin Gupta 6 years, 2 months ago
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Harsh Yadav 6 years, 1 month ago
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