Aclown balances a small spherical grape at the top of his bald head, which also has the shape of a sphere. after drawing sufficient applause, the grape starts from rest and rolls down without slipping. it will leave contact with the clown's scalp when the radial line joining it to the center of curvature makes what angle with the vertical?

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

You yeah with the side of the yeah with a little bit of yeah.

I'm not sure what your asking buddy.. but i know that you can weld two peices of steel by pure force and pressure.