1) briefly explain how we can use spectral lines to determine an object's radial motion. can we also learn the object's tangential motion (across our line of sight) from its spectral lines? 2) time dilation on the space station. the space station orbits earth at a speed of about 30,000 km/hr. while 1 hour passes on earth, how much time passes on the station? assume that both the station and earth are in free-float frames, although in reality they are not.

What is the reason for the “scramble for africa”?

When you start from a given set of rules and conditions and determine what must be true you are using blank reasoning

15 points need quick 1. looking at your graph and the geologic time scale during what period did this rock form? what is the age span of the rock, in millions of years? 2. this rock sample is limestone and shale. with what you know about rock formation, what type of environment did these organisms live in? 3. if some of these fossil samples were found in a rock also containing leaf fossils, could you use radiocarbon dating to determine the age of this rock? explain.