Will give which item is necessary to make an electromagnet?

Macy always thought there were only a few hair colors blonde brown and black however when she actually began looking around she saw varying shades of these hair color what is a possible reason for so many different hair colors

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero

Is the vertical component of velocity ever zero?