There is still air inside of a house, which is pushing the roof upwards, so the forces are equal and the roof is not crushed.
it allows only a reduced number of electrons to flow through it.
Answer:
Explanation:
Caty , Use the relativity formula for length. ( they teach this in H.S. ? ) it's from my Modern Physics in college, A 300 level class
L = 

L = 3 
L = 0.9367496998 meters
L = 0.94 meters approx