A student is building a circuit which material should she use for the wires and why? A. A metalloid such germanium, because only some of its atoms have mobile electrons.
B. A nonmetal such as carbon, because its atoms have tightly bound electrons.
C. A noble gas such as krypton, because its atoms are far apart and it is nearly inert.
D. A metal such as copper, because its atoms have very mobile electrons.

Asimple speed reducer is composed of 2 spur gears. the pinion gear has a pitch diameter of 0.75" and 36 teeth while the driven gear has a pitch diameter of 4.0" and 192 teeth. a)-what is the diametral pitch of each gear? b)-if an electric motor rotating ccw at 3000 rpm is coupled to the pinion, what is the rotational speed of the driven gear? c)-if the torque delivered to the pinion is 1 n-m, what is the torque on the driven gear? d)-what is the power transmitted by the gear train?