Makayla is conducting an experiment. she places a large block on the ramp and prepares to time the block as it moves down the ramp. when the block is released, it does not move. makayla places a piece of wax paper between the block and the ramp. this time the block slides easily down the ramp. which of the following best explains the job of the wax paper?

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).