Question about energy (explosions)

AI Thread Summary
To determine the energy needed to destroy an object at a specific distance from an explosion, one can use the concept of energy dispersion over a spherical surface. The energy released by the explosion spreads uniformly in all directions, allowing for calculations of energy per square meter at a given radius. The inverse-square law is relevant here, as it states that the intensity of energy decreases with the square of the distance from the source. For example, if the energy needed to destroy a planet is known, one can calculate the required initial explosion energy based on its distance from the blast. Understanding these principles simplifies the calculations involved in assessing the impact of explosive events.
nicholas0211510
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I'm new to physics I tried doing some research but I can't seem to fully grasp the concept.
My question is, how would one find how much energy is needed to destroy a object a select distence away from the blast

For example if a star when super nova and had a x amount of joules, and let's say a planet was 10 AU away, and that planet was Earth and the energy needed to destroy it was 2×10^32 joules

How would you calculate the intensity of the intial explosion to be able to still destroy the planet at that distance?

I believe it was square inversed law but I'm not sure could someone help me out?
 
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Hi nicholas0211510. :welcome:

If the energy spreads out uniformly in all directions, then imagine a sphere totally enclosing the exploding body. At whatever distance out from the centre of the exploding body you choose to draw the enclosing sphere, all that liberated energy will be spread over the surface of the sphere and you can calculate a Joules/m2 figure for that radius out. Do this calculation for whatever distance away the planet is located, and see whether you can figure out the remaining step.
 
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Thank you, I didn't imagin it would be as simple as that
 
I figured you would need to find a lot of variables like I was reading about the square inversed law, but i guess that formula does not associate with the topic at all?
 
nicholas0211510 said:
I figured you would need to find a lot of variables like I was reading about the square inversed law, but i guess that formula does not associate with the topic at all?
The inverse-square law certainly does apply: if you double the radius of the enclosing sphere, the Joules/m2 changes by a factor of 1/4.
 
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I see, I appreciate the help
 
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