An unknown mineral is scratched by a penny. it must a: be talc b: have a mohs hardness of 10 c: be softer than a diamond d: have perfect cleavage

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).

This lab will not "work" for some people - they won't be able to collect a clump of dna for their necklace. explain how it is possible to have actually extracted dna from your cheek cells, yet at the end of the lab procedures, it is not obviously visible.

Ameteorite has a speed of 90.0 m/s when 850 km above the earth. it is falling vertically (ignore air resistance) and strikes a bed of sand in which it is brought to rest in 3.25 m. (a) what is its speed just before striking the sand?