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.
How far does a helium Balloon travel upwards to the sky, before it pops? When you let a Helium balloon free, it sets of upwards but gets lost in the sky, how far up does it go before it pops, and does it fall straight back down wherever it explodes.Follow.hen you let a Helium balloon free, it sets of upwards but gets lost in the sky, how far up does it go before it pops, and does it fall straight back down wherever it explodes. Add your answer.