Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)

Thread Rating:
  • 1 Votes - 1 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Physical World And Measurement
Post: #1

.docx  1377953416-PHYSICSNOTES.docx (Size: 109.75 KB / Downloads: 11) Physical World And Measurement

Chapter 1

K.V. Aizawl
Physical World And Measurement
There are four fundamental forces which govern both macroscopic and
microscopic phenomena. There are
(i) Gravitational force (iii) Electromagnetic force
(ii) Nuclear force (iv) Weak force
The relative strengths of these forces are
Fg :Fw:Fe:Fs=1:1025:1036:1038
All those quantities which can be measured directly or indirectly and in terms of
which the laws of physics can be expressed are called physical quantities.
(a) Fundamental quantities (b) Derived quantities.
The units of the fundamental quantities called fundamental units , and the units of
derived quantities called derived units.
System of units:-
(a) MKS (b) CGS © FPS (d) SI
• The dimensions of a physical quantity are the powers to which the
fundamental quantities are raised to represent that physical quantity.
• The equation which expresses a physical quantity in terms of the fundamental
units of mass, length and time, is called dimensional equation.
• According to this principle of homogeneity a physical equation will be
dimensionally correct if the dimensions of all the terms in the all the terms
Absolute error ( Δa ) = amean - ai Where ai = measured value
It may be - positive, negative or zero.
(i) Mean absolute error
(ii) Relative error - it is the ratio of the mean absolute error to the true
δa = I Δa I/ amean
(iii) The relative error expressed in percent is called percentage error.
The error is communicated in different mathematical operations as detailed below:
(i) For x = (a ± b), Δx = ± ( Δa + Δb)
(ii) For x = a x b , Δx/x = ± ( Δa/a + Δb/b)
(iii) For x = a/b , Δx/x = ± ( Δa/a + Δb/b)
(iv) For x= an

Quick Reply
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
Music mobile phone detector and jammer circuit diagram and pdf Guest 0 0 17-06-2017 01:23 PM
Last Post: Guest
  measurement of distance using light dependant resistor viva voce Guest 1 181 06-05-2017 10:39 AM
Last Post: jaseela123
Wink mechanical measurement and instrumentation ak sawhney pdf free download Guest 1 165 06-05-2017 09:42 AM
Last Post: jaseela123
  advantages disadvantages of physical memory in 8086 ppt Guest 1 242 29-04-2017 10:45 AM
Last Post: jaseela123
  ppt on performance and emission characteristics jatropha and pongamia biodiesel Guest 0 0 23-04-2017 02:00 PM
Last Post: Guest
  physical chemistry by puri sharma pathania pdf book Guest 1 155 21-04-2017 11:36 AM
Last Post: jaseela123
  advantages and disadvantages of ledged braced and battened doors Guest 1 186 20-04-2017 11:43 AM
Last Post: jaseela123
  large scale power generation using fuel cell ppt and document and abstract Guest 1 0 29-03-2017 09:57 AM
Last Post: jaseela123
  a visit to well equipped commercial office and its aim and objectives Guest 1 0 07-03-2017 10:12 AM
Last Post: jaseela123
Thumbs Up aims and objectives of documents used in banks and offices Guest 2 0 21-02-2017 11:10 AM
Last Post: jaseela123
This Page May Contain What is Physical World And Measurement And Latest Information/News About Physical World And Measurement,If Not ...Use Search to get more info about Physical World And Measurement Or Ask Here