# Did I calculate this right?

#### Bossbrosish

I'm trying to calculate the Demon Realm size in Neon Cavaliers which is a planet 40 times the size of Jupiter. I wasn't sure how to find the size, so I took the radius and mass of Jupiter and multiplied them by 40, then plugged the numbers into this calculator, getting 8.255×10^37 joules or Dwarf Star Level. Did I do it right? The calculation would apply to The Devil King, Alex, Matt, Leo in his Cerberus Full power Unleashed Form, and Connor in his Pseudo-Orange Phoenix Form once I finish writing Chapter 34.

Probs

#### Furudo_Erika

If the radius is 40x larger and the density remains the same as Jupiter, then the mass would be 64,000x that of Jupiter, according to the square cube law.

#### Bossbrosish

I see. Thank you.

#### Furudo_Erika

Actually, I can make this calc very easy.
I just need one more thing...how strong is the Demon Realm's gravity? As in, just as strong as Earth, 2x, 10x, etc?

#### Furudo_Erika

This is effectively reverse-operating surface gravity, thus we can accurately find the mass of the planet.

#### Bossbrosish

The gravity is 100x that of Earth

aight

#### Furudo_Erika

So:
Radius of Demon Realm: 2,796,400 kilometers
Acceleration: 980.665 m/s^2

Mass = 1.149e+32 kilograms (Stellar)
GBE: 1.891e+44 joules, or 1.981 Foe (Large Star level)

#### Furudo_Erika

Let me just say this: If the planet was 40x larger than Jupiter, but only having 40x mass...
The gravity of Earth, would be over 15x stronger than the Demon Realm.

Alright thanks

You're welcome

#### Bossbrosish

Might I ask where you went to do the calculations so I can practice myself?

#### Furudo_Erika

Here to find the mass of the planet.
Here to find the GBE of the planet.

Thanks

#### Bossbrosish

Quick question, to find the square cub law of a sphere the formula would be 4*pi*r^2, correct?

#### Furudo_Erika

Uh, no?
Square cube law states: When an object undergoes a proportional increase in size (As in, an increase in size in all three dimensions), its new volume is proportional to the cube of the multiplier.

So if the radius of a sphere is 2x larger than another sphere, the difference in volume would be 2^3, or 8x the volume.
Or if it is 3x larger, it would be 3^3 larger, or 27x the volume.
4x larger = 4^3, or 64x the volume.

The increase in mass is also proportional to the difference in volume if the density stays the same.
So a sphere that has 8x the volume would also have 8x the mass, if the density is the same.

Last edited:

#### Furudo_Erika

Also 4 * pi * r^2 is the surface area of a sphere.
Volume of a sphere is: 4 / 3 * pi * r^3.

I see. Thanks.

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