Which of these, both of the same length, has the greater electrical resistance? O A thick copper wire.
O Athin copper wire.
O Both have the same resistance because they are made of copper.
O Both have the same resistance because they have the same length. The width of the wire doesn't matter.

the device is called “ rocket engine”

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me