Apipe open at both ends produces a fundamental frequency of 262 hz in air at 20°c. if the is filled with helium at the same temperature, what fundamental frequency does it produce? assume the speed of sound in helium is 972 m/s. assume the speed of sound in the air at 20°c is 343 m/s.
a. 972 hz
b. 430 hz
c. 741 hz
d. 1113 hz .

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).