Misc 19 - A cylindrical tank of radius 10 m being filled wheat - Miscellaneous

Slide29.JPG
Slide30.JPG

  1. Chapter 6 Class 12 Application of Derivatives
  2. Serial order wise
Ask Download

Transcript

Misc. 19 A cylindrical tank of radius 10 m is being filled with wheat at the rate of 314 cubic meter per hour. Then the depth of the wheat is increasing at the rate of (A) 1 m3 /h (B) 0.1 m3 /h (C) 1.1 m3 /h (D) 0.5 m3 /h Let r be the radius of cylindrical tank & V be the volume of cylindrical tank & h be the depth of the cylindrical tank Given that cylindrical tank of radius 10m being filled with wheat at the rate of 314 cubic meter per hour i.e. Change if volume of tank is 314 m3/hr. when r = 10 i.e. ﷐𝑑𝑉﷮𝑑𝑡﷯ = 314 m3/hr. when r = 10 We need to find at what rate depth is increasing i.e. we need to find ﷐𝑑ℎ﷮𝑑𝑡﷯ We know that Volume of cylindrical tank = πr2h, & Given ﷐𝑑𝑉﷮𝑑𝑡﷯ = 314 m3/hr. when r = 10 ﷐𝑑𝑉﷮𝑑𝑡﷯ = 314 ﷐𝑑 ﷐𝜋﷐𝑟﷮2﷯ℎ﷯﷮𝑑𝑡﷯ = 314 ﷐𝑑(𝜋﷐102﷯ℎ)﷮𝑑𝑡﷯ = 314 ﷐𝑑(100𝜋ℎ)﷮𝑑𝑡﷯ = 314 ﷐100 𝜋 𝑑(ℎ)﷮𝑑𝑡﷯ = 314 ﷐𝑑ℎ﷮𝑑𝑡﷯ = ﷐314﷮100𝜋﷯ ﷐𝑑ℎ﷮𝑑𝑡﷯ = ﷐314﷮100 × 3.14﷯ ﷐𝑑ℎ﷮𝑑𝑡﷯ = ﷐314﷮314﷯ ﷐𝑑ℎ﷮𝑑𝑡﷯ = 1 Since depth is in meter & time is in hr So, ﷐𝑑ℎ﷮𝑑𝑡﷯ = 1m/hr. Thus, The depth of the tank change at 1m /hour So, A is the correct answer.

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He provides courses for Mathematics from Class 9 to 12. You can ask questions here.
Jail