Final answer:
When the governor cuts out after pressure builds, the pressure increases due to the reduced volume of containment or increased temperature, causing gas molecules to collide more frequently and with greater force.
Step-by-step explanation:
When discussing pressure increase due to a governor cutting out, we're addressing a concept that belongs to Physics, notably the behavior of gases. Pressure, by definition, is the force applied per unit area on an object or container walls by the collisions of gas molecules. If the gas molecules were to stop moving, the pressure would drop to zero because there would be no collisions to exert force on the container’s walls.
Temperature is directly related to pressure; a rise in temperature causes gas particles to have more kinetic energy and thus collide more frequently and forcefully, resulting in increased pressure. Conversely, if the volume of a container is reduced, the gas molecules have less space to move, leading to more frequent collisions and a rise in pressure.
Considering the governor cut out, and assuming it leads to a large amount of energy being added or the volume being decreased, an increase in pressure would occur. In scenarios where temperature increases significantly or volume decreases, the pressure does not remain the same or decrease; it escalates. Hence, the correct answer to what happens when the governor cuts out after pressure builds is: the pressure increases.