The masses and radi of the earth and moon are m, r and mp, r respesctively. their centres are at distance d apart. the minimum velocity with which a particle of mass m should be projected from a point milway berween their centres so that it escapes to infinity is (m,+m (r +r) (a) 2-d nd 57. a thin rod of length l is bent to form a semicircle. the mas whar will be the gravitatiónal potential at th

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.