6. To which of these abrasive disks can you
apply a water-coolant?
(A) Concrete
(B) Metal

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

It is really hard for me right know

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system