TASK DEFINITION: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
PROBLEM: What determines the model of forces?, Context: For certain physical scenarios, it is impossible to model forces as being due to gradient of potentials. This is often due to macrophysical considerations that yield forces as arising from a macroscopic statistical average of microstates. For example, friction is caused by the gradients of numerous electrostatic potentials between the atoms, but manifests as a force model that is independent of any macroscale position vector. Nonconservative forces other than friction include other contact forces, tension, compression, and drag. However, for any sufficiently detailed description, all these forces are the results of conservative ones since each of these macroscopic forces are the net results of the gradients of microscopic potentials.

SOLUTION: gradient of potentials

PROBLEM: There's no road around what establishment?, Context: The highest pub in the United Kingdom is the Tan Hill Inn, Yorkshire, at 1,732 feet (528 m) above sea level. The remotest pub on the British mainland is The Old Forge in the village of Inverie, Lochaber, Scotland. There is no road access and it may only be reached by an 18-mile (29 km) walk over mountains, or a 7-mile (11 km) sea crossing. Likewise, The Berney Arms in Norfolk has no road access. It may be reached by foot or by boat, and by train as it is served by the nearby Berney Arms railway station, which likewise has no road access and serves no other settlement.

SOLUTION: The Berney Arms

PROBLEM: Which major isotope of uranium is the most common?, Context: Natural uranium consists of three major isotopes: uranium-238 (99.28% natural abundance), uranium-235 (0.71%), and uranium-234 (0.0054%). All three are radioactive, emitting alpha particles, with the exception that all three of these isotopes have small probabilities of undergoing spontaneous fission, rather than alpha emission. There are also five other trace isotopes: uranium-239, which is formed when 238U undergoes spontaneous fission, releasing neutrons that are captured by another 238U atom; uranium-237, which is formed when 238U captures a neutron but emits two more, which then decays to neptunium-237; uranium-233, which is formed in the decay chain of that neptunium-237; and finally, uranium-236 and -240, which appear in the decay chain of primordial plutonium-244. It is also expected that thorium-232 should be able to undergo double beta decay, which would produce uranium-232, but this has not yet been observed experimentally.

SOLUTION:
uranium-238