Occurs when its going from one medium to another. But remember when the density of the medium is changed, the velocity of the wave would most likely change.
Answer:
43850.49112 kg
Explanation:
M = Mass of moon = ![7.36\times 10^{22}\ kg](https://tex.z-dn.net/?f=7.36%5Ctimes%2010%5E%7B22%7D%5C%20kg)
r = Distance from Moon's center = ![5.23\times 10^6\ m](https://tex.z-dn.net/?f=5.23%5Ctimes%2010%5E6%5C%20m)
G = Gravitational constant = 6.67 × 10⁻¹¹ m³/kgs²
m = Mass of black hole
F = Force = 7870 N
From the universal force of gravity we have
![F=\frac{GMm}{r^2}\\\Rightarrow m=\frac{Fr^2}{GM}\\\Rightarrow m=\frac{7870\times (5.23\times 10^6)^2}{6.67\times 10^{-11}\times 7.36\times 10^{22}}\\\Rightarrow m=43850.49112\ kg](https://tex.z-dn.net/?f=F%3D%5Cfrac%7BGMm%7D%7Br%5E2%7D%5C%5C%5CRightarrow%20m%3D%5Cfrac%7BFr%5E2%7D%7BGM%7D%5C%5C%5CRightarrow%20m%3D%5Cfrac%7B7870%5Ctimes%20%285.23%5Ctimes%2010%5E6%29%5E2%7D%7B6.67%5Ctimes%2010%5E%7B-11%7D%5Ctimes%207.36%5Ctimes%2010%5E%7B22%7D%7D%5C%5C%5CRightarrow%20m%3D43850.49112%5C%20kg)
The mass of the mini black hole is 43850.49112 kg
I would say that it is Meteors, Meteorites, and comets. (METEORS may be wrong)