What can student do to increase the force of attraction of magnet on the iron(metal) block?

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

What is the mass of each element in a 324.8 sample of co2

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d