A number 10 AWG copper wire has a resistance of 0.9989 ohms per 1,000 feet and a cross sectional area of 10,380 CM. Of the resistance of copper wire is inversely proportional to its cross-sectional area, what would be the resistance of 1,000 feet of Copper wire with a cross section of 5,178 CM?

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?