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.
The formula for calcium oxide is CaO.
I think it because of UV rays ultra violet ray which can make their colors different
The model bridge captures all the structural attributes of the real bridge, at a reduced scale.
Part a.
Note that volume is proportional to the cube of length. Therefore the actual bridge will have 100^3 = 10^6 times the mass of the model bridge.
Because the model bridge weighs 50 N, the real bridge weighs
(50 N)*10^6 = 50 MN.
Part b.
The model bridge matches the structural characteristics of the actual bridge.
Therefore the real bridge will not sag either.