reference point

Motion: Whenever a body changes its position continuously with respect to the position of other bodies around it then it is said to be in motion Rest: An object which does not change its position with respect to its surroundings is said to be at rest Distance: It is the actual length of the..

Summary - Motion: Whenever a body changes its position continuously with respect to the position of other bodies around it then it is said to be in motion Rest: An object which does not change its position with respect to its surroundings is said to be at rest Distance: It is the actual length of t..

>Within the general reactivity or activity series there are some periodic table trends: Down Group 1 (I) the "Alkali Metals" the activity increases Cs > Rb > K > Na > Li. Down Group 2 (II) the activity increases eg Ca > Mg. On the same period, the Group 1 metal is more reac..

Let the object O be viewed with our eyes which is at a distance of r, making an angle q between the two eyes as shown in the diagram. The angle q , caused by the two lines drawn from the position of the two eyes to the object, is called angle of parallax. If we can consider OA and OB as r..

) The lasers are used for drilling tiny holes in diamonds for drawing fine wires. (iv) They are used in precision surveying. Because of its high intensity and exceptional directionality, the laser is an excellent tool for surveying. In order to be certain that a bridge or tunnel is being constructe..

.e., its reaction is fast and more exothermic. This also implies that the reverse reaction becomes more difficult i.e., the more reactive a metal, the more difficult it is to extract from its ore. The metal is also more susceptible to corrosion with oxygen and water. The reactivity series can be es..

The word force in common usage refers to a push or pull. The word Mass is also just as familiar as the word force. A super tanker is one that contains an enormous amount of mass. In comparison a coin does not contain much mass. During the seventeenth century Newton developed three importa..

. There are weather satellites which monitor wind speed, cloud temperature and height, sea temperature, etc. This data helps to predict climate changes. Spy satellites use powerful telescopes to watch for potential threats. There are also Remote Sensing Satellites. Remote sensing refers t..

One joule is the work done when the point of application of a force of one newton moves through a distance of one metre in the direction of force. 1 N m is referred as joule after the British Scientist James Prescott Joule. The letter 'J' denotes Joule. Higher units of work ..

Nitriles need relatively stronger reagents for reduction. Nitriles undergo reduction to form primary amines as the products. This type of reduction can be carried out using reducing agents like H 2 in the presence of catalysts like Pt, Ni etc., Na in C 2 H 5 OH or LiALH 4 . ..