accelerated free fall
31g-force — This article is about a type of acceleration. For other uses, see G force (disambiguation). This top fuel dragster can accelerate from zero to 160 kilometres per hour (100 mph) in 0.86 seconds. This is a horizontal acceleration of 5.3 g …
32Force — For other uses, see Force (disambiguation). See also: Forcing (disambiguation) Forces are also described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate …
33Gravitation — is a natural phenomenon by which objects with mass attract one another [http://math.ucr.edu/home/baez/physics/Relativity/GR/grav speed.html Does Gravity Travel at the Speed of Light?] , UCR Mathematics . 1998. Retrieved 3 July 2008] . In everyday …
34Peru — Peruvian /peuh rooh vee euhn/, adj., n. /peuh rooh /, n. 1. Spanish, Perú /pe rddooh /. a republic in W South America. 24,949,512; 496,222 sq. mi. (1,285,215 sq. km). Cap.: Lima. 2. a city in N central Indiana. 13,764. 3. a city in N Illinois. 10 …
35Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …
36SR-71 Blackbird — infobox Aircraft name = SR 71 Blackbird caption =An SR 71B Trainer over the Sierra Nevada Mountains of California in 1994. Note second cockpit is raised for the instructor. type = Strategic Reconnaissance manufacturer = Lockheed Skunk Works… …
37Insect wing — Original veins and wing posture of a dragonfly. Hoverflies hovering to mate …
38Science in Medieval Western Europe — consisted of the study of nature, including practical disciplines, the mathematics and natural philosophy. During the Middle Ages Western Europe would see a virtual collapse of civilization at the era s outset leading to a period of intellectual… …
39Collapse of the World Trade Center — Coordinates: 40°42′41.12″N 74°00′44.00″W / …
40Weight — This article is about the physical concept. For other uses, see Weight (disambiguation). A spring scale measures the weight of an object (according to the operational definition) …
