The hubble telescope’s orbit is 5.6 × 10^5 meters
above earth’s surface. the telescope has a mass
of 1.1 × 10^4 kilograms. earth exerts a gravitational
force of 9.1 × 10^4 newtons on the telescope. the
magnitude of earth’s gravitational field strength
at this location is
(1) 1.5 × 10^−20 n/kg (3) 8.3 n/kg
(2) 0.12 n/kg (4) 9.8 n/kg

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.