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.
Note: all information listed in italics refers to future proposed standards that are not yet validated, certified, or commercially available. 1  MT/s = Mega Transfers per second. 2  MB/s = Megabytes per second. 3  ns = Nanoseconds (billionths of a second) 4  SDR = Single Data Rate. 5  DDR = Double Data Rate. 6  SIMM = Single Inline Memory Module.