Using a streak test on a mineral that is harder than 7 on Mohs scale would not be very useful True or False Fracture is the way minerals break along smooth planes of weakness. True or False

Cleavage is the way minerals break with uneven, jagged or rough surfaces True or False

The way light reflects off a mineral is called transparency. True or False

Minerals are the building blocks of rocks. True or False

Mohs scale measures a mineral’s streak. True or False

Color is the most reliable test for identifying a mineral. True or False

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?