The answer is D) N/m^2, because we are talking about the pressure inside the tire, which has to be greater than the outside pressure, in order to keep up the shape of the tire.
The pressure is the result of a force which is acting on a surface, in this case, tire's surface. As we know, the unit of measure for force is Newton [N] and the unit of measure for surface is [m^2]. That's way, talking about the pressures, inside/outside, we are taking about Forces exercised on surfaces.
Explaining the process: If the pressures inside and outside the tire wouldn't be equal, then the shape of the tire would change, as one or the other of the pressures is greater. If the form is maintained constant, that means that the interior force which is pushing off orthogonally is equal with the exterior force which is pushing in, but forces having opposite directions.
No comments:
Post a Comment