1. The stone thrown towards sky always falls down, why? 2. How is the frictional force produced?
3. Why the stone moves away when the string is broken during rotation?
4. How can we show the magnetic force on a magnet? Illustrate with examples

1.because of gravitational force.

2.By rubbing hands.

Explanation:

3.When the string breaks the stone no longer rotates around its center of rotation, but won't suddenly move directly away from it, and will instead continue to follow its path of inertia. That is, it will continue to move in the direction in which it was moving at the moment the string broke.

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)