50. "Three resistors, having resistances of 4.98 X 10"$2, 2.4/ X 10" $2, and 9.2/ X 10" $2, are wired in series (Fig. 1-10). Find the total resistance, using the equation for resistors in series, Eq. A63: R = R1 + R2 + R3+ .... 2 FIGUR 51. Find the equivalent resistance if the three resistors of Problem 50 are wired in parallel (Fig. 1-11). Use the equation for resistors in parallel, Eq. A64: () = ()+ ( R7 ) + ( R.) +... to find the resistance in parallel. 52. A wire 4.75 x 103 cm long is seen to stretch, when loaded, by 9.55 x 1072 cm. Find the strain in the wire, using the equation & = +, where L is the original length and e is the extension or increase in length. (Strain is a unitless quantity or pure number.) 53. How many hours will it take a rocket travelling at a rate of 3.2 x 10 miles per hour (mi./h) to travel the 3.8 x 108 miles (mi.) from the Earth to the Moon? Use the basic physics equa- tion D = Rt, or distance = rate X time. (Remember to manipulate the equation to calculate for time.) FIGURE