Markeisha needs to create an electromagnet for her science project. She needs to create a magnet that can pick up
iron filings out of a mixture of substances. Which list of materials would best help Markeisha build her electromagnet?
glass rod, wire, battery
glass rod, string, battery
string, battery, metal nail
battery, metal nail, wire

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.

Will you chech and finish these for me, because i am stumped with them.

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio