air at 80 F is to flow through a 2 ft pipe at an average velocity of 6 ft. sec. what size pipe whould be used to move

i think they are all correct

explanation:

they seem good

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

there are no contact forces mentioned on the list of choices that you've provided.

part 1: which substance has a higher solubility?

a

smallest amount left undissolved atall temps in table shown most has dissolved high sol'by