1) Find the average speed (in km/h) of a racing horse that turns a lap on a 2 km oval track in 2.5 minutes. While running at km/h, how far can it travel in 3.5 h ?

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Ways that industry and agriculture use physical properties to separate substances