Question

What will happen when a needle hits the Earth with the speed of light from the space ?

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Answer 1

★ Solution :-

Honestly, this had been a question of many people that what will happen when a needle hits the Earth with a speed of light from a space.

But the thing is, if I say the solution you might think it as a confusing thing until you understand it practically. Let's look at the attachment for this.

We see that needle is falling from the space to the earth. What's the first thought which comes to your mind ?

It might be like the needle will dig up a deep hole in earth's crust. No not at all. This is initially a hypothetical thing. In real life we can have three conditions related to this question .

• Needle won't exist :

This doesn't means that needle will disappear. Actually we know that earth has a thick layer of atmosphere over it. And in the atmosphere as well as at some more height over atmosphere, a body can feel gravitational force of earth. This means the body will be attracted by the gravity of the earth. It is given that the needle is to strike the earth with the speed of light. So if the needle is travelling with the speed of light and is attracted by gravity then its speed will increase. But before coming to earth it has go through the layer of atmosphere of earth. When the needle will go through this, it will face frictional force which will generate heat to the needle which will cause it to melt because a needle is made up of simple metal.

• Go beneath the earth surface ::

Let's think now that possibly needle would survive that means it won't melt. Thus when it will strike the earth surface it will penetrate into it which can be proved by Second Equation of Motion. But by third Law of Motion, earth will also provide a opposing force to the needle which will act as a resistive force to its motion.

Now comes the twist. Here we get three possibilities ::

• If that layer of earth is much harder and rigid, the penetration of needle will me less.

• If that layer of earth is not hard instead soft, then the penetration will be comparitibly more than the previous case.

(In both cases momentum of needle will be same because the velocity is same only).

• Float and resonating effect ::

We see that in qúestion it is given that if needle hits the Earth not Earth's surface. So it means if it comes in contact with atmosphere, then too it will be regarded as needle hits the Earth because atmosphere is the part of Earth.

Now if the needle survives after the atmospheric friction then due to its light wieght it will start floating in the air. We see that the speed of needle is equal to speed of light. But due to the friction of atmosphere and the air, its velocity will be decreased . And thus due to its light weight its velocity/momentum will decrease so much that it will start to float and thus land safely on the Earth's Surface.

Note :: These are hypothetical outcomes because if needle can travel with the speed of light then it can go beyond the dimensions and can travel in Space - Time world.

Answer 2

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The answer is that they are very fast. Generally speaking, these small celestial bodies can easily reach tens of thousands of meters per second, so they all have huge kinetic energy.

The situation when a needle hits the earth with the speed of light from the space , The first is that it disintegrates due to the high temperature in the atmosphere, and its energy will be released into the atmosphere, and part of it will be To hit the earth directly, the second is to hit the surface of the earth, the earth will takes all its energy, and the third is to directly pas through the earth, and the earth only takes part of the energy.

Hope it helps uh !!