reference point

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..

Sound is a form of energy. It is produced by the vibration of particles and it travels in a wave-like motion. The number of waves passing a point per second is called the frequency and its unit is Hertz (Hz). The pitch of the sound (high or low sounding) is measured by the frequency. Man..

>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..

) 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..

In theoretical terms, the lowest possible temperature that can be reached is the temperature of - 459.4 o F at which a gas has theoretical volume of zero. This temperature is referred to as 'Absolute Zero'. A temperature scale, with absolute zero as the starting point is called ..

.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..

Introduction - 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 develope..

Usually the term 'alcohol' refers to ethanol. Man has been using ethanol for thousands of years especially in the form of wine. The structural formula of ethanol is given as follows: Its molecular formula is CH 3 CH 2 OH or C 2 H 5 OH Ethanol is colourless liquid and has a pleasant ..

One joule is the work done, when the point of application of a force of one Newton moves through a distance of one meter in the direction of force. 1Nm is referred as joule after the British Scientist James Prescott Joule. The letter 'J' denotes Joule. Higher units of wor..

In covalent solids, the constituent particles are atoms of same or different kinds. Covalent bonds network, forming a continuous giant interlocking structure of atoms throughout the crystal that hold them together. They are also referred to as covalent network solids. Because, covalent bo..