Final answer:
Gravitational force is a long-range force acting on the crate, and electromagnetic forces may also act as long-range forces if magnetic or electrical fields are present.
Step-by-step explanation:
The long-range forces acting on the crate can be identified based on their ability to act over a distance without direct contact. From the options provided, gravitational force is indeed a long-range force, as it can act over a significant distance even without direct contact between objects. It is governed by the mass of the objects and the distance between them. Electromagnetic forces, which include magnetic force and electrical force, are also long-range and can dominate at the human scale.
In contrast, frictional force, tension force, normal force, and centripetal force are contact forces, which means they only occur as a result of contact between surfaces or objects. Therefore, the correct long-range forces acting on a crate would be gravitational force and potentially electromagnetic forces if magnetic or electric fields are present.