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.
meter per second (m/s or m/sec) Share this item with your network: The meter per second (symbolized m/s or m/sec) is the Standard International ( SI ) unit of linear speed. This quantity can be defined in either of two senses: average or instantaneous. Average linear speed is obtained by measuring the distance in meter s that an object travels in a certain number of second s, and then dividing the distance by the time.