Unit and Dimensions, Physics

     

Physics is one of the types of science. Science works according to scientific method . The scientific method accepts only logic, reason, and experimental evidence to tell between what is scientifically correct and what is not correct. Scientists do not simply believe - they test, and keep on testing until they get satisfied. Just because some "big or well known scientist" says something is right, that thing does not become the fact of science. Unless a discovery is repetitively established in different laboratories at different times by the different people, or the same theoretical result is obtained by the clear use of established rules, we do not accept it as a scientific discovery. The real strength of the science lies in the fact that it continually keeps on challenging itself.

 

2.   It is consideration that the laws of physics do not change from place to place. This is why experiments carried out in different nations by different scientists - of any religion or race - have always led to the similar results if the experiments have been performed honestly and correctly. We also think that the laws of the physics today are the same as they were in the past time. Evidence, contained in the light which left distant stars billions of years ago, strongly signifies that the laws operating at that time were no different than those today. The spectra of the different elements then and now are impossible to tell apart, even though physicists have glanced very carefully.

 

3.   This course will cover the underwritten broad categories:

a)  Classical Mechanics , which deals with the motion of bodies under the action of forces. This is generally called Newtonian mechanics as well.

b)  Electromagnetism , whose objective is to study how charges behave under the influence of electric and magnetic fields as well as understand how charges can create these fields.

c)  Thermal Physics , in which one studies the nature of heat and the changes that the addition of heat brings about in matter.

d)  Quantum Mechanics , which primarily deals with the physics of small objects such as atoms, nuclei, quarks, etc. Though, the Quantum Mechanics will be treated only briefly for shortage of time.

Each and every physical quantity can be expressed in the terms of three basic fundamental dimensions: Length (L), Mass (M), and Time (T). Some examples are given below:

 

Speed                        L T -1
Acceleration               L T -2
Force                      M L T -2
Energy                    M L 2T -2
Pressure                 M L -1T -2

 

You cannot add quantities that have different dimensions. So force can be added to force, but force can never be added to energy, etc. A formula is definitely wrong if the dimensions on the left and right sides of the equal sign are different.

 

 

Posted Date: 7/25/2012 6:58:42 AM | Location : United States







Related Discussions:- Unit and Dimensions, Assignment Help, Ask Question on Unit and Dimensions, Get Answer, Expert's Help, Unit and Dimensions Discussions

Write discussion on Unit and Dimensions
Your posts are moderated
Related Questions
Determine the Superposition Principle The Superposition Principle for numerous electric potentials, unlike electric fields and forces, is summed algebraically.  Electric potent

Q. Why the centre of Newton's rings pattern appears dark? The thickness of the air film becomes zero at the point of contact of lens L with glass plate P. Therefore there is no

A plane diffraction grating of width 2.5cm has 1500 rulings. Monochromatic light of wave length 5893A 0 is incident normally on it. Determine the angle at which second order princ


Path of a projectile The apparatus below can be used to indicate the independence of the horizontal and vertical velocities of a projectile. The projectile is a metal ball, and

Specially designed diodes, which give out light radiations when forward biases. LED'S are made of GaAsp, Gap etc.


4 transitor bias circuit

Determination of packing fraction of diamond  The co-ordination number of an atom in diamond structure is 4 as can be seen from the unit cell of diamond and is loosely packed.

What are the basic requirements of a Laser? Basic requirement of a Laser are as follows: 1. Active Medium: Active basic medium is needed to start the laser action. There