The resistivity of pure copper is 17 nano-Ohm-meters. How many times more resistive than copper is the nickel-chrome wire used in this experiment? (In other words, calculate the ratio of these resistivity values)

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.