Which statement is true for a car that first goes around a curve of radius r at a constant speed v, and then goes around the same curve at half the original speed? a. the centripetal force is twice as big the second time around. b.the centripetal force is four times as big the second time around. c.the centripetal force is one-half as big the second time around. d.the centripetal force is one-fourth as big the second time around.

"why is graphite used instead of gold or copper wires to conduct electricity in very hot situations such as an industrial kiln? " that's the question, but the thing is, i don't even understand what an "industrial kiln" xd assistance would be < 3

Acar moves a distance of 50.0 km west, followed by a distance of 64.9 km north what was the magnitude of the displacement of the car, in units of kilometers?

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?