IIT-Basics in Physics

A black hole is high strength gravity in a region of space time, that means no particles or even light particles cannot escape it. The boundary of the region from which cannot escape  is possible is called the Event Horizon.    About this black hole see the video              Fig: Black holes Black holes can be big or small. Scientist's guess the smallest black holes are as small as just one atom. These black holes are very mini but have the mass of a large mountain.                Another kind of black holes are called  "Stellar". Its mass may be up to 20 times more than the mass of the sun. There may be many stellar mass black holes in Earth's galaxy. We know that Earth's galaxy is called the "Milky Way".                The largest black holes are called "Supermassive". These black holes may be have masses that are more than 1 million suns together. S...

Any body is falling freely from some height(h) due to gravity is called freely falling bodies. This is best example of motion in vertically a straight line with uniform acceleration. How can we find out the freely falling bodies velocity, displacement and time taken ? We can find out using equations of motion.                        Let us consider vertically upward direction taken as the positive Y-axis  and vertically downward direction taken as negative Y-axis.             So here freely falling bodies ,                                                                 a= -g                                  Initial velocity (u)=0   ...

1) Given that v=10+3t, (in S.I.Units) using this equation find acceleration ? 2)Given that s=ut+1÷2(at2), (S.I.Units) using this equation find initial velocity? 3)A car moving with a speed of 20m/s can be stopped by applying brakes, after travelling a distance of 10m. The negative Acceleration of the car? 4) A bus travelling with velocity of 54 kmph is brought to rest by applying brakes. It experiences a uniform retardation of 5m/s2. Before coming to rest, how much distance travelled by the bus? 5) A man initially at rest starts moving with a uniform acceleration 'a'. The ratio of the distances covered by it in the first second  and the first four seconds is ? You see this solutions in below video.  1) If a car having an initial velocity 4 m/s,  moves with a uniform acceleration of 2 metre per second square, then the final velocity when it covers a distance of 5 metres is ?                          2)A bus s...

Acceleration                  The rate of change of Velocity is called Acceleration. If a body is moving with initial velocity 'u' after some time final velocity 'v' then                              Change in Velocity   Acceleration =--------------------------------                                 Time taken                           Final Velocity(V)- Initial Velocity(U)                        = ----------------------------------------------------                                          Time taken              ...

Speed             A body covered 'd' distance during time  interval t1 to t2. How can we say that the body is covered 'd' distance per time interval t1 to t2 ?  So, we want to relation between distance and time. The ratio of distance to time is equal to one physical quantity is called speed. The rate of change of distance by a body is called speed of the body. Speed is very important transport field. Speed of a body is measured by device is called "speedometer". We can see speedometer device in vehicles. This device is very useful to drivers for safe driving. Speed has only magnitude and hasn't direction. So, speed is a scalar quantity.                                      Distance covered by a body                  Speed   =  ____________________________           ...

Classical Mechanics: It's divided into two main parts. These are                                1.Statics                               2.Dynamics 1.Statics: It's the study of stationary bodies under external forces in macroscopic system.  2.Dynamics: It's the study of moving bodies under external forces in macroscopic system. It's divided into two subdivisions.  These are                    1.Kinematics                   2.Kinetics 1. Kinematics: It's the study of moving bodies without causes of motion of the bodies. For example: A body is falling freely from tower. How much distance it traveled? How much its velocity and acceleration? How much its time taken?  2.kinetics: It's the study of moving bodies with causes of motion...

Physics is the study of nature. we are divided physics based on time, two main parts. Up to 1900 AD physics laws and theories is considered as a CLASSICAL PHYSICS. After 1900 AD or 20th century physics laws and theories is considered as a MODERN PHYSICS.  CLASSICAL PHYSICS: Father of classical physics is SIR ISAAC NEWTON was born on Christmas day, 25 December 1642. He has completed education in University of Cambridge, Royal Society and Royal Mint.He was explained in physics   " Laws of Motion ", " Universal Law of Gravitation" and "Optics". He was famous  law of Gravitation  and Newton's  laws of Motion. He was explained Natural philosophy, Alchemy, Theology, Mathematics,  Astronomy and Economics also.                                                         C.P. has classified based on different concepts. The...

Everyone read physics concepts ,but few members don't  understand and few members understand very easily. What is difference between this two category members?                 Let's  i explain about these two category members. Few members are not observe surroundings scientifically, they are only see normally means one tree leafs move to and fro. They are observed, leafs are moving that only. Few members are understand very easily, because they are see surroundings scientifically, that means one tree leafs move to and fro. They are do so many questions themselves,  why are leaves  moving ? They will get idea due to air. What is air? again. Air is a mass.what is mass ? Mass is the amount  of matter contained in a body. What is matter? Matter is a substance occupies  some space.What is a substance? So many questions asks themselves. They will easily understand this type of analysis members.     So, observ...