This website focuses on the Channel Tunnel (or "Chunnel") in the UK. The News sections contains press releases, images, notes to the editors, and features. ...
This website provides an interesting history of the New York Subway as well as numerous other resources on subways. The home page boasts four random subway...
This website highlights subways around the world by presenting city subway maps from Amsterdam to Zürich. The site also includes pages dedicated to indexing ...
This interesting website reviews "lost subways," including photos, articles, and other historical information. The Tower Hill Subway was England's first tube...
This website from Federal Transit Administration reviews some of the challenges involved in subway design. On this page, visitors will find the aims of the...
Part of MIT's innovative OpenCourseWare Project, that provides materials from MIT classes to the public on the web, the materials on this site are from an...
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A dense ball packs more mass in the same volume, so it has more momentum at any given velocity. Thus a dense ball travels further because it loses a smaller proportion of its kinetic energy to the surrounding fluid.
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