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.
Scooter Rack. Scooter Rack for practically every sized Scooter on the market today... The Scooter Rack is our FULL sized Mobility Scooter Carrier. As far as we know, there isn't a Mobility Scooter in Australia today that won't fit onto it. All of our Racks have the left hand ramp (unloading on the footpath side) which is a legal requirement in all states of Australia.