What are the advantages and disadvantages of microwave and radiowave as effective communcation in space travel?
Does a bullet that is shot straight up return to the ground at the same speed and if so, why? One the moon, in the absence of air resistance, mechanical energy of projectiles is conserved. When it returned to the same level (same gravitational PE) it would have the same kinetic energy. On the Earth, falling small objects quickly reach a speed at which the force of drag equals their weight: their terminal speed. For a bullet, this would be several tens of metres per second, whereas a bullet is usually fired at hundreds of m/s. Return to top of page and menu Astrophysics Question: Recall the components of the electromagnetic spectrum and describe the properties of each component. Explain why some of these wavebands can only be detected from space-based observations. “Components” probably means the names for the different wavelength ranges, which are listed below. The atmosphere (including the water in it) absorbs many ranges, including nearly all of the high energy photons from ultraviol
