Problem: In particle physics, this inequality permits a qualitative understanding of virtual particles which carry momentum, exchange by which and with real particles, is responsible for the creation of all known fundamental forces (more accurately known as fundamental interactions). Virtual photons (which are simply lowest quantum mechanical energy state of photons) are also responsible for electrostatic interaction between electric charges (which results in Coulomb law), for spontaneous radiative decay of exited atomic and nuclear states, for the Casimir force, for van der Waals bond forces and some other observable phenomena.
What results in Coulomb law?
The answer is the following: electrostatic interaction between electric charges

Problem: Hunter-gatherer societies manifest significant variability, depending on climate zone/life zone, available technology and societal structure. Archaeologists examine hunter-gatherer tool kits to measure variability across different groups. Collard et al. (2005) found temperature to be the only statistically significant factor to impact hunter-gatherer tool kits. Using temperature as a proxy for risk, Collard et al.'s results suggest that environments with extreme temperatures pose a threat to hunter-gatherer systems significant enough to warrant increased variability of tools. These results support Torrence's (1989) theory that risk of failure is indeed the most important factor in determining the structure of hunter-gatherer toolkits.
What does temperature impact on tool kits?
The answer is the following: increased variability of tools

Problem: There are seven state parks within the confines of New York City, including Clay Pit Ponds State Park Preserve, a natural area which includes extensive riding trails, and Riverbank State Park, a 28-acre (110,000 m2) facility that rises 69 feet (21 m) over the Hudson River.
How large is Riverbank State Park in acres?
The answer is the following: 28

Problem: In the 2015 US News & World Report America's Best Graduate Schools, the law school is ranked 18th nationally, out of over 180 law schools. In particular, its Clinical Education Program is currently ranked 4th in the nation. This year, the median score placed the average student in the 96th percentile of test takers. The law school offers a full-time day program, beginning in August, for the J.D. degree. The law school is located in a state-of-the-art building, Anheuser-Busch Hall (opened in 1997). The building combines traditional architecture, a five-story open-stacks library, an integration of indoor and outdoor spaces, and the latest wireless and other technologies. National Jurist ranked Washington University 4th among the "25 Most Wired Law Schools."
Where is the Washington University School of Law ranked in the 2015 US News & World Report America's Best Graduate Schools?
The answer is the following:
18th