Suppose that a piece of polystyrene insulation board has a thermal conductivity of k ... copper has a thermal conductivity of about 400 W / m * K . If you want to make a wall of copper that provides the same insulation as a 4 -cm polystyrene board , how thick does the copper wall have to be ( in meters )?.

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle

How do you think the different landforms of northern and southern europe would affect ways of life in those two areas

Canada must balance the economic opportunities offered by its natural resources with the need to maintain links to the united states maintain high tariffs preserve the environment protect its borders