PLS HELP PLS Awhina is constructing an electromagnet to demonstrate at the upcoming science fair. She is using wire, a nail, and a battery.

How would this electromagnet work?

What is the increase in density of a medium due to wave travel?

What part of the ear is names after tools, such as the hammer and the anvil?

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?