1. which type of wire would be a better conductor of an electrical current?
a. short, fat, cold wire
b. long, thin, warm wire

2. as the collisions between electrons and protons increase, the electrical current will
a. increase
b. decrease

3. which change will cause an increase in the resistance of conductivity?
a. changing from a long wire to a shorter wire.
b. sunlight heating up a wire.
c. exchanging a thin wire for a much thicker wire.

for the ! < 3

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.