Water flows past a flat plate that is oriented parallel to the flow with an upstream velocity of 0.4 m/s. (a) determine the approximate location downstream from the leading edge where the boundary layer becomes turbulent. (b) what is the boundary layer thickness at this location? assume that the water tempetature is 15.6 oc. use approximate physical properties of some common liquids (si units).

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?

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Positrons are spontaneously emitted from the nuclei of