Physicsrapper
New member
- Joined
- Aug 16, 2014
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- 3
10 000 cubic km of water can cover all the continents with a layer 7 cm deep.
Find the depth of the water layer if 10 000 cubic km of water is spread over a sphere with radius R = 6370 km.
I already tried everything, but still didn't get the right answer.
The solution must be d = 2 cm
I know, that it's easy when you divide the volume by the surface area of the sphere.
Volume of the sphere: 4/3*π*r^3 ---> is 10 000 km^3 the volume?
Surface of the sphere: 4*π*r^2 ---> it's 4/3*π*6370^3 = 509.9 * 10^6 , isn't it?
So I wanted to devide 10 000 km^3 by 509.9 * 10^6, but it doesn't funcion.
What did I wrong?
Find the depth of the water layer if 10 000 cubic km of water is spread over a sphere with radius R = 6370 km.
I already tried everything, but still didn't get the right answer.
The solution must be d = 2 cm
I know, that it's easy when you divide the volume by the surface area of the sphere.
Volume of the sphere: 4/3*π*r^3 ---> is 10 000 km^3 the volume?
Surface of the sphere: 4*π*r^2 ---> it's 4/3*π*6370^3 = 509.9 * 10^6 , isn't it?
So I wanted to devide 10 000 km^3 by 509.9 * 10^6, but it doesn't funcion.
What did I wrong?