Some life forms move so slowly that their movement cannot be detected by normal observation. the best way to determine any movement is by placing a mark at some point, and observing any change in position from it. why is this true?

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

Consider a production line with five stations. station 1 can produce a unit in 9 minutes. station 2 can produce a unit in 10 minutes. station 3 has two identical machines, each of which can process a unit in 12 minutes (each unit only needs to be processed on one of the two machines. station 4 can produce a unit in 5 minutes. station 5 can produce a unit in 8 minutes. which station is the bottleneck station?