Use the weight of the ball that you calculated in activity b to determine how much work would be required to lift the ball 2 meters above zero

Answer(b) 60 miles per hour;

Answerapplying a direct current to a non magnetic material in order to create a electromagnetic field; plz check first good luck;

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips.