The angle made by an area of a sphere at its centre equal to 2 times the square of its radius is a.. one degree b..two degree c..one revolution d..2 steradian..

Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo. how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?

Excuse ! extra points plus ! super desperate ! the position of an object does not move relative to a reference point. relative to the reference point the object _. a.) is not moving. b.) is moving.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease