Earphone definition, a sound receiver that fits in or over the ear, as of a radio or telephone. See more.
Answer Wiki. If a rocket went straight up, it would either continue in that direction and leave Earth, or it would fall back down, depending on its velocity. Most rockets intend to enter orbit, which is an elliptical trajectory, and it's much more efficient to arc into this trajectory than to go straight up and then accelerate laterally.
Lol, no really, they do go up if you do it right. There are many sights on the internet that show you how to construct your bottle rocket. Youâve got to make your launching pad to hold the bottle rocket while you add the air pressure. Air pressure and water is what is used to make it fly.