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.
Amp rack, short for amplifier rack, a piece of furniture in which amplifiers are mounted. Bicycle rack, a frame for storing bicycles when not in use. Bustle rack, a type of storage bin mounted on armored fighting vehicles. Drying rack, for hanging clothing to dry. Pallet racking, structural racks (usually steel) for storing palletised loads.