DEFINITION of 'Human Development Index-HDI'. A tool developed by the United Nations to measure and rank countries' levels of social and economic development based on four criteria: Life expectancy at birth, mean years of schooling, expected years of schooling and gross national income per capita.EFINITION of 'Human Development Index-HDI'. A tool developed by the United Nations to measure and rank countries' levels of social and economic development based on four criteria: Life expectancy at birth, mean years of schooling, expected years of schooling and gross national income per capita.
A top and bottom gear rack are moving in the same direction but with different velocities (top rack 5 m/s and bottom rack 3 m/s). What is the angular velocity of the small attached gear B at the instant shown? Assume the top rack, bottom rack, and link AB remain horizontal.
One rack unit is 1.75 inches (44.45 mm) high. While the rack unit describes the height (or number of Units) for both 19 and 23 wide racks, it is 19 wide racks that are most commonly used for computer equipment, which is usually 17.25 (438 mm) wide (and placing it into a 23 wide Racks would waste space).he 23 racks are from the Western Electric 23-inch standard, with holes on 1-inch (25.4 mm) centers; it is still used in legacy ILEC / CLEC facilities. The height of rack-mounted equipment is frequently described as a number in U.