Aplane wall, 7.5 cm thick, generates heat internally at a rate of 105 w/m3. one side of the wall is insulated, and the other side is exposed to an environment at 90oc. (i. e. the fluid is at a temperature of 90oc.) the convection heat transfer coefficient between the wall and the environment is 500 w/(m2 k). if the thermal conductivity of the wall is 12 w/(m k), calculate the temperature in the center of the wall.

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.

How to calculate voltage drop in a series circuit