Water flows through a 3.40  cm  diameter hose at 1.20×10−4  m3/s  .what is the flow speed

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

Explain why electric current cannot exist if a current doesn't have a voltage source.

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.