Tag: #special relativity

Climate change : In India and World today .

Let’s double down on solar energy, let’s be more energy-efficient, let’s weatherize our homes. We can build a better, healthier economy based on good-paying, clean energy jobs.”

Ian Somerhalder, Actor

Being one of the second largest country , climate change in India is having profound effect on India and all over the world . India is ranked fourth among the list of countries most affected by climate change in the period from 1996 to 2015 .

With 7% of global emissions , India emits about 3 gigatonnes (Gt) CO2eq of greenhouse gases each year; about two and a half tons per person, which is half the world average.

Due to the rise in temperature , the Tibetan plateau are causing problem to Himalayan glaciers . It directly effect in increasing the flow rate of the Ganges , Brahmaputra, Yamuna and other major rivers.

The Indira Gandhi Institute of Development Research has reported that, if the prediction of the Intergovernmental Panel on Climate Change is correct about Global warming than it may cause fall of GDP upto 9%.

In all over the world , climate change is drastically affecting the change in temperature of the globe 🌎 . Climate change includes both global warming driven by human-induced emissions of greenhouse gases and the resulting large-scale shifts in weather patterns.

Causes :

Human envision and green house gasses are two important causes in the climate change. Greenhouse gases affect Earth’s energy balance and climate .Human activities have added greenhouse gases to the atmosphere. Human activities are changing the climate.

Other causes :

  • Power Plants.
  • Farming .
  • Deforestation.
  • Fertilizers.
  • Oil drilling.
  • Natural gas drilling.
  • Permafrost.
  • Garbage .
  • Volcanic eruption.
  • Pollution.

Campaigns

There are many campaigns that are going on . One of them is The ActNow campaign . It was launched at the UN Climate Change Conference (COP 24) in December 2018, with a call from Sir David Attenborough in conjunction with the award-winning “People’s Seat” initiative.

It signifies individual action on climate change and sustainability. By changing our habits and making choices that have less harmful effects on the environment, we can tackle the climate emergency and build a more sustainable world.

It is also working with other campaigns like The Good life goals , Anatomy of action , 170 actions to combat climate change , lazy person guide to saving the world , connect4climate , climate neutral now , trash hack , stop the waste , Think. Eat. Save. , Clean seas , breathe life , glowing glowing gone . Their may be others as well .


Prevention :

Becoming more energy efficient is a great way to prevent pollution. It causes the power plants to expend less energy that can lead to the production of greenhouse gases. … Replace your light bulbs with energy-efficient light bulbs that help you save electricity too.

  • Speak up!
  • Power your home with renewable energy.
  • Weatherize, weatherize, weatherize.
  • Invest in energy-efficient appliances.
  • Reduce water waste.
  • Actually eat the food you buy—and make less of it meat.
  • Buy better bulbs.
  • Pull the plug(s).

Conclusion

In the times , where the world is changing and taking measurements for saving the globe . Many Environmentalist , Actors , Politicians , Countries are taking precautions and actions on the climate change . It is our duty to prevent our world from falling . Take Initiative To Save The World .

Climate change is real. It is happening right now, it is the most urgent threat facing our entire species and we need to work collectively together and stop procrastinating.

Leonardo Di Caprio, Actor & Environmentalist

Link

Special Relativity Made Easy

Does the word “special relativity” strike fear in your heart? It might seem tough at first glance but it is very easy to understand. 

Postulates

Special theory of relativity is a theory regarding space and time, given by Albert einstein. The main postulates of this theory are: 

1]The Principle of Relativity : The laws of physics are the same in every inertial frame of reference. 

2]The Principle of Invariant Light Speed :The speed of light in vacuum is the same in all inertial frames of reference and is independent of the motion of the light source.

Now, let us understand these two postulates. The first postulate basically means that physical laws, for example, Newton’s laws of motion and laws of electromagnetism, are independent from the choice of inertial systems.  If the laws differed, that difference could distinguish one inertial frame from the others or make one frame somehow more “correct” than another. However, all frames of reference are correct in their own way. Suppose you watch two children playing catch with a ball while the three of you are aboard a train moving with constant velocity. Your observations of the motion of the ball, no matter how carefully done, can’t tell you how fast (or whether) the train is moving. If seen from outside, all three appear to be moving with the train at constant velocity.  This is because Newton’s laws of motion are the same in every inertial frame.

Let’s think about what the second postulate means. Suppose two observers measure the speed of light in vacuum. One is at rest with respect to the light source, and the other is moving away from it. Both are in inertial frames of reference. According to the principle of relativity, the two observers must obtain the same result, despite the fact that one is moving with respect to the other. Now suppose a spacecraft moving with constant velocity turns on a searchlight. An observer on the spacecraft measures the speed of light emitted by the searchlight and obtains the value. According to Einstein’s second postulate, the motion of the light after it has left the source cannot depend on the motion of the source. So the observer on earth who measures the speed of this same light must also obtain the same value. This result contradicts our elementary notion of relative velocities, and it may not appear to agree with common sense. But “common sense” is intuition based on everyday experience, and this does not usually include measurements of the speed of light. 

Speed of light as a constant

Einstein’s second postulate immediately implies the following result: It is impossible for an inertial observer to travel at c, the speed of light in vacuum. We can prove this by showing that travel at c implies a logical contradiction. Suppose that the spacecraft is moving at the speed of light relative to an observer on the earth, so that If the spacecraft turns on a headlight, the second postulate now asserts that the earth observer measures the headlight beam to be also moving at c. Thus this observer measures that the headlight beam and the spacecraft move together and are always at the same point in space. But Einstein’s second postulate also asserts that the headlight beam moves at a speed relative to the spacecraft, so they cannot be at the same point in space. This contradictory result can be avoided only if it is impossible for an inertial observer, such as a passenger on the spacecraft, to move at.

Hopefully, now you can brag that you know the special theory of relativity.

https://cosmo.nyu.edu/hogg/sr/sr.pdf
https://en.wikipedia.org/wiki/Special_relativity