1. A wire is made out of aluminum with a cross-sectional area of 5.510⁴ m2m2 and a length of 45 kmkm. Assume the resistivity of aluminum is 2.65108m2.65108m.

What is its resistance?

2. Car batteries are rated by the following two numbers: (1) cranking amps=current the battery can produce for 30.0 seconds while maintaining a terminal voltage of at least 7.2 VV and (2) reserve capacity=number of minutes the battery can produce a 25-AA current while maintaining a terminal voltage of at least 10.5 VV. One particular battery is advertised as having 905 cranking amps and a 155-minute reserve capacity.

Which of these two ratings represents the greater amount of energy delivered by the battery?Which of these two ratings represents the greater amount of energy delivered by the battery?

the 155-minute reserve capacity

905 cranking amps