a. The same atmospheric pressure that's pushing the window from the outside is also pushing on the window from the inside. So the forces are balanced.
b. If a strong wind is blowing <em>across</em> the window pane, the pressure will drop, as described by the Bernoulli principle. So the pressure inside will be greater than the pressure outside, causing the window to bow out a little.
weight can also be added by muscle. not necessarily fat. so if you have a lot of muscle so that adds weight you can be very powerful but can mover very slow.
