An alpha particle with a kinetic energy of 13.0 mev makes a head-on collision with a gold nucleus at rest. part a: what is the distance of closest approach of the two particles? (assume that the gold nucleus remains stationary and that it may be treated as a point charge. the atomic number of gold is 79, and an alpha particle is a helium nucleus consisting of two protons and two neutrons.)

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

Which of the choices are parts of an atom? select all that apply. a.) compound b.) electron c.) neutron d.) molecule e.) photon f.) proton g.) element

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative