A spherical volume of space has an electric field of intensity 130 N/C directed radially outward from it surface of radius 0.4 m. What is the net charge enclosed within this surface? (ε0 = 8.85 × 10–12 F/m)

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.