The radius of the moon is one_fourth and its mass is one eighty-first that of the earth. if the acceleration due to gravity on the surface of the earth is 9.8m/s square what is its value on the moon surface (pls ans that for

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.