Which phrase describes speed? O A. A scalar quantity
O B. A vector quantity
O C. A quantity with direction only
O D. A quantity with no units

Describe uniform velocity and variable velocity in short

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.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87