Suppose you want to to double a copper wire's resistance. To what temperature, in degrees celsius, must you raise it if it is originally at 23°c, neglecting any changes in dimensions?.

0.55x745.7j and a calculator

that would be because of both gravity and friction. so     c

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.