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.
Converting between speed and velocity units-m/s, km/h, knots, mph and ft/s. v = s / t (1) where v = velocity (m/s, km/h, mph ..) s = distance traveled (m, km, miles ..) t = time taken (s, hours ...). Speed is the rate of covering distance and can expressed as. v = s / t (1). where. v = velocity (m/s, km/h, mph ..).