Atrain leaves the station heading west on the tracks. it takes the train 8 seconds to reach 80 miles per hour. it completes the entire 160 mile trip in two hours. calculate the train's average speed and velocity over the two hour trip. show your work. identify if each of the measurements are a scalar or vector quantity.

Suppose you are making a map of stars around the sun, and you draw earth 1 cm from the sun on your map. the brightest star in the night sky is 8.6 light-years from the sun. on your map, how far would you place that star from the sun?

Anew moon would be directly overhead at what time

30 a town is built on the banks of a small lake on the edge of a desert. after some time, the townspeople discover that water from the lake has become too polluted to use. describe one way that the lake may have been contaminated by the actions of the townspeople, and explain how the townspeople can remediate this problem.