Question

All are the same question in my text.

(1)(A)A copper wire has a resistance of 0.560 Ω at 20.0°C, and an iron wire has a resistance of 0.592 Ω at the same temperature. At what temperature are their resistances equal? The temperature coefficient of resistivity for copper is 3.90 10^-3(°C)⁻¹ and for iron it is 5.00 10^-3(°C)⁻¹.

(B)What is the power of a 125 MV lightning bolt having a current of 23,400 A?

(C)What power is supplied to the starter motor of a large truck that draws 265 A of current from a 27.5 V battery hookup?

(D)SPEAR is a storage ring at the Stanford Linear Accelerator which has a circulating beam of electrons that are moving at nearly the speed of light (2.998 10⁸ m/s). If a similar ring is about 94.0 m in diameter and has a 0.48 A beam, how many electrons are in the beam?

Answer 1