Your friend wants to make an electromagnet strong enough to lift a heavy metal object. What are some suggestions you would give him on how to make the electromagnet strong enough? tried to make it scince didnt have the opption

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.