An 90 g aluminum calorimeter contains 390 g of water at an equilibrium temperature of 200C. A 160 g piece of metal, intially at 3050 C, is added to the calorimeter. The final temperature at equilibrium is 320 C. Assume there is no external heat exchange. The specific heat capacities of aluminum and water are 910 and 4190 J/kg. K, respectively. The specific heat capacity of the metal is closest to:

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.