A block of iron quickly sinks in water, but ships constructed of iron float. A solid cube of iron 1.90 m on each side is made into sheets. From these sheets, to make a hollow cube that will not sink, what should the minimum length of the sides be? (density of iron is 7860 kg/m³)

3.781488032m or greater

Explanation:

General Rule of thumb is that any thing that is less dense than water will float in it.

So

density of water is 997Kg/m^3 and density of iron on the other hand is  7860kg/m^3.

so to make iron less dense it has to be in larger volume.

mass of the given cube is 53911.74Kg and we have contain it in volume such that density is less than water, mathematically this translates to .

left side is density of iron and right side is density of water, solving v in this inequality gives us.

which means each side is . so the minum is just greater than that.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

im guessing the west of station b