What is the definition of a electromagnet?

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

What is friction? how does it affect the motion of an object?

Contrast the force of gravity between these pairs of objects: 1-kg mass and a 2-kg mass that are 1 m apart; a 1-kg mass and a 2-kg mass that are 2 m apart; and two 2=kg masses that are 1 m apart. i dont understand.