effective contact area
41Friction — For other uses, see Friction (disambiguation). Classical mechanics …
42Chemical force microscopy — Figure 1: Photograph of an AFM system which can be used for chemical force microscopy. Chemical force microscopy (CFM) is a variation of atomic force microscopy (AFM) which has become a versatile tool for characterization of materials surfaces.… …
43Microphone — For the indie film, see Microphone (film). Microphones redirects here. For the indie band, see The Microphones. A …
44tonga — /tong geuh/, n. a light, two wheeled, horse drawn vehicle used in India. [1870 75; < Hindi tanga] * * * Tonga Introduction Tonga Background: The archipelago of The Friendly Islands was united into a Polynesian kingdom in 1845. It became a… …
45Tonga — /tong geuh/, n. a Polynesian kingdom consisting of three groups of islands in the S Pacific, NE of New Zealand: a former British protectorate. 100,105; ab. 270 sq. mi. (700 sq. km). Cap.: Nukualofa. Also called Tonga Islands, Friendly Islands.… …
46Terminal ballistics — Terminal ballistics, a sub field of ballistics, is the study of the behavior of a projectile when it hits its target. It is often referred to as stopping power when dealing with human or other living targets. Terminal ballistics is as relevant… …
47automobile — automobilist /aw teuh meuh bee list, moh bi list/, n. /aw teuh meuh beel , aw teuh meuh beel , aw teuh moh beel, beuhl/, n. 1. a passenger vehicle designed for operation on ordinary roads and typically having four wheels and a gasoline or diesel… …
48Artificial heart valve — An artificial heart valve is a device implanted in the heart of a patient with heart valvular disease. When one of the four heart valves malfunctions, the medical choice may be to replace the natural valve with an artificial valve. This requires… …
49Hedgehog (weapon) — For the area denial weapon, see Czech hedgehog. The Hedgehog was an anti submarine weapon developed by the Royal Navy during World War II, that was deployed on convoy escort warships such as destroyers to supplement the depth charge. The weapon… …
50Dye-sensitized solar cell — A selection of dye sensitized solar cells A dye sensitized solar cell (DSSC, DSC or DYSC[1]) is a low cost solar cell belonging to the group of thin film solar cells.[2] …
