Answer
Bernoulli’s principle underlies these 3 observations.
Work Step by Step
a. the pressure will be lowered where the air is moving fastest, between the car and the truck. The car and truck will be pushed toward one another by the greater outside pressures.
b, c. Inside the convertible and inside the old train, atmospheric pressure is greater than the outside where air is rushing by the vehicle. The roof is pushed up, or the windows are pressed outward.
This is discussed on pages 273-275.
