Where are warm air vents usually located in a forced air heating system

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.

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system

The force it would take to accelerate an 900-kg car at the rate of 6m/s2