Building codes usually limit the current carried by a no. 14 copper wire to 15 a. many household circuits are wired with this size wire. what is the drift velocity of the electrons in this case? the diameter of no. 14 wire is 1.6 mm. assume one conduction electron per atom in copper. the atomic weight of copper is 63.3 and its density is 8900 kg/m3.

a. 4.89 x 10-5 m/s
b. 4.56 x 10-4 m/s
c. 5.52 x 10-4 m/s
d. 4.44 x 10-2 m/s
e. 1.65 x 10-3 m/s

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.