12. You can move a super heavy box with a force of 30 Newtons. If you move the box 45 meters in 25 seconds, how much power are you using?
a. 1.2 Watts
b. 1.8 Watts
c. 54 Watts
d. 1. 350 Watts

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space? the cloud is extremely hot. the cloud is visible primarily because it reflects light from nearby stars. the cloud is cool and lies between you and a hot star. the cloud is cool and very dense, so that you cannot see any objects that lie behind it.