A tube of air contains a feather and a quarter in it. both object are dropped at the same time. The quarter falls faster than the feather. However, when the air is removed from the tube to create a vacuum, both the feather and the quarter fall at the same rate. Explain why this happens.

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me