One concept for hypersonic air-breathing propulsion is a detonation-combustion RAMJET, in which fuel added to the air burns in a detonation wave. As a simplified model for analysis of such a device, assume that the standing detonation can be modeled as a normal shock wave followed by a region of constant-area heat addition that

The primary agent of contact metamorphism is

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

Residents of moldova are mainly a. russian b. ukrainian c. serbian d. romanian the answer is d. romanian