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.
Also check out the hardcore half rack available for those of you who like to train without a spotter and use barbells for bench presses, squats and deadlifts. 1  IM2000 Self Spotting Machine 5 out of 5. 2  IM1500 Half Rack Weight Lifting System 5 out of 5. 3  IM1500 Package A 0 out of 4  5. IM1500 Package B 0 out of  5.