## Black Holes - Try This!

# Black Holes

### Oops! You need to be a bit more careful with your calculations next time! Our solutions are:

**Using the following equation, confirm the radius of the black hole for the mass of the Earth.****R = 2MG/c**= .86 cm^{2}where M

_{e}= 5.8 x 10^{27}g, G = 6.67 x 10^{-8}gm^{2}/sec^{2}, and c = 3 x 10^{10}cm/sec.**If you could weigh a thimbleful (about 1 cm**^{3}) of the black hole/Earth, how much would it weigh?3.87 x 10

^{27}g**What would be the black hole radius of the Sun, given its mass of 2 x 10**^{33}g?296,600 cm = 2.966 km

This activity was developed by Jacqueline Slay, Largo High School, Largo, MD