Correct answer only ! i cannot retake this and i need all correct answers !

true or false: doorbells, scrap yards, and rock concerts are all examples of every day uses of electromagnets.

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

If y gets smaller as x gets bigger and y have an relationship?

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?