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
Standing Wave Formation Below given animation depicts two waves moving by a medium in opposite directions. The blue wave is moving to the right and the green wave is moving to

Avogadro's hypothesis (Count A. Avogadro; 1811) At the same temperature and pressure, equal volumes of all of the gases contain equal numbers of molecules. In fact, it is, only

What mechanical and electronic device has a name derived from a Czechoslovakian word meaning "work; compulsory service"? Ans: From a Czechoslovakian word meaning "work; com

Derive First law of thermodynamics When an amount of heat energy is supplied to the system, part of it enhances internal energy of the system and remaining is utilized by the s


Two 20-g ?atworms climb over a very thin wall, 10 cm high. One of the worms is 20 cm long, the other is wider and only 10 cm long. Which of them has done more work against grav

list the factors used to classify inductors.

In general the total energy of a harmonic oscillator having of two parts,  potential energy (P.E) and kinetic energy (K.E.), the former being because of its displacement from the m

why is the colour of sky blue

i want more clarification on resultant vectors