Third law of kapler's

Third law of kapler's

Third law of Kapler or Orbital period of planet is  very important from the third law of kapler Newton got idea of " Inverse square law" so what is the third law of kapler ? let discuss it.

  • According to the third  law of kapler "The cube of mean radius of  a planet from sun is directly proportional to the square of orbital time period (Orbital time period of a panet  is the time taken by a planet to complete on revolution around the sun) of a planet"

     


kapler's second law

kapler's second law

What is the second law of Kapler'?

Let discuss it according to the second law of Kapler's " Every planet covers equal area in equal time of period" what does mean it so that very simple theory for understanding Kapler's second law says that every planet travel equal area on its elliptical path in equal time of period.

By the first law of kapler' every planet moves in a elliptical orbit and we know ellipse does not have a certain focus or centre like a sphere, ellipse have two focus and sun could be at anyone out of two when a planet being near the sun its mean radius from sun is small so that the covered area by planet would be small so as for as a planet goes away from the sun its mean radius increase obviously the covered area is also increase so if a planet moving near the sun the covered area would be small and when it moving far away the the sun covered area by planet would be large but that's not happen.

Because planet does not moving with a constant velocity around sun.

When a planet be near the sun it has extreme velocity as far as it goes away from the sun its velocity is decreased  that's the reason it covers equal area in equal time period and this velocity by which it covers area knows as Areal velocity of planet.


Energy

Energy

First you need understand that what kind energy exist in universe then we know well there are two type of energy exist in our universe. Cosmic energy could be two type-visible energy and dark energy , only light energy of our universe which comes from sun we utilise.So yes all living things consume cosmic energy which comes from sun.

  1. visible energy or light energy -light energy which can be seen in the form of light.And sun is the primary source of this energy all living things consume this energy in different form like we consume sun light in the form of vitamin D and plants use it in photosynthesis so this light or cosmic visible energy is being used in the production of green vegetable and we eat vegetable and this energy which consume by our body from vegetable is conversed in ATP. it all about food chain.

  2.     Dark energy- Dark energy is exist in the major part of our universe.The amount of dark energy in our universe is more and more than to visible energy and that amount of dark energy is totally unused first we had perception that mass and energy both are different  things but Einstein purposed that mass and energy is not different things.

        by E=MC^2 we can understand the relation between mass and energy.


mass and weight

mass and weight


What is the mass and what is  the weight of a object?

That is the very obvious question which we should be known.

So let discuss first what is the mass of an object "Mass is the very special characteristic of a object  or substance or matter by which it covered area"

Mass is a constant quantity through the whole universe that does not matter where it is placed.

 

                                          Weight of a object-

what is the weight of an object so we know well about the weight of an object

WEIGHT OF AN OBJECT ＝ MASS ✖ ACCELERATION DUE TO GRAVITY

So by this relation we can understand what is the weight of a object if mass of an object is multiple by gravity of surface by this we can get the weight of a object or matter.

w= mg 

where m is the mass of object and g is the gravity of surface on which object is placed.Weight is not a constant quantity through the whole so weight of a matter or object could be different on the different places in universe.

NOTE- Weight of an object could be zero but mass of an object could not be zero



Mass and weight on moon and earth

Mass and weight on moon and earth

You want to comparison weight of an object between Earth and Moon.

First we calculate weight of an object which is placed on the surface of earth after that we would calculate weight of same object at the surface of moon.

Let discuss first what is the weight of an object so we know well about the weight of an object

WEIGHT OF AN OBJECT ＝ MASS ✖ ACCELERATION DUE TO GRAVITY

Now let  know first what is the Mass of an object.

So we have two definition of mass of an object let  discuss first definition of mass of an object "Mass is the very special characteristic of an object by which  it covered area"

Let discuss in other word " Mass is the property of an object by which it resist to change in its state"

Now we compare weight of an object at the surface on earth as well as on  the surface of moon.

let an object have M mass and it is placed at the surface of earth and gravity at the surface of earth is g 

so weight of object on the surface of earth = Mg

Now weight of the same mass object on the surface of moon= M ✖ g/6

weight on moon surface = Mg/6

Because we know well gravity on the surface of moon is 1/6 of earth

So we got the conclusion that . 

Weight on the earth surface of an object ＞Weight on the Moon surface of an object


**What happens when we push a wall? Work done =o? Or work done is there with net work =0?

**What happens when we push a wall? Work done =o? Or work done is there with net work =0?

If you are pushing a wall but there has not been done any work done.How do you know that its obvious formula we have.

WORK DONE=APPLIED FORCE ✖ DISPLACEMENT

you are pushing wall constantly but  wall does not move that mean no displacement has been done by you and if displacement is zero then what work done by you would be zero.

But you were constantly pushing the wall that mean some energy has been spend by you on pushing the wall but there is no  work done made by you.So where is your energy which has been spend by you on pushing the wall?

Let discuss it think about the law of conservation of energy we can not produce energy  neither we can destroy
we all are familiar about the third law of Newton Every action has a reaction"
so when you were applied a force  on wall for pushing it at the same time wall also exerted a equal and opposite force on you  so you all energy has been spend by this oppisite and equal force which was exerted on you by wall.

What is the future of energy?

What is the future of energy?

First we need to understand what is the energy and second things where we are
living that is very obvious question we all know that we are living in a frame what kind of frame in which we are living so this frame is our universe and what is the component by which our universe is made up. So we have to theories relative the composition of our universe.First theory which was applicable before according this theory there are two component by which our universe made.

 first component is mass and second is energy but according to the second theory which was developed by Albert  Einstein according to e=mc^2 that means energy and mass both are same things they are not different individually so there are only two things in our universe one is energy or mass and space so our frame in which we are living this is composed by energy and space if you look this term at the view angle of physics then past present or future they exist all time but we are living in non initial frame becuase everything in our universe doing acceleration so everything which do we do that is image and when this images relate with time then we can see all images is going like movie ..so if this question is not vaild in itsself what is the future of energy we all know well energy can not be produce or not destroye so what would be the future of a thing which never be produce or never can be destroyed  it always remain constant.