Class I Help HW 12 Begin Date: 10/30/2017 11:00:00 AM - Due Date: 11/13/2017 11:
ID: 1780391 • Letter: C
Question
Class I Help HW 12 Begin Date: 10/30/2017 11:00:00 AM - Due Date: 11/13/2017 11:00:00 AM End Date: 11/13/2017 11:00:00 AM (10%) Problem 5: Water flows smoothly through a pipe with various circular cross-sections of diameters 2D, 6D, and D, respectively 2D 6D ©theexpertta.com 25% Part (a) In which section is the volume flow rate largest? Choose the best answer 25% Part (b) In which section is the speed of the water largest? Choose the best answer 25% Part (c) What is the ratio of the speed in section 3 to the speed in section 1? Grade Summary 5% 95% sind) | cos() | tan() | | (!)| 7| 8| 9 cotan asinac atan acotan)sinh0 cosh tanh cotanh0) Submissions Attempts remaining: 4 (5% per attempt) detailed view os0 5% 0 END o Degrees Radians CE Submit Hint I give up!Explanation / Answer
Here
part a) USing Equation of continuity
the flow rate is same in all the the pipes
part b)
as flow rate = flow speed * area of cross section
the flow rate is maximum where the area is minimum
the area is minimum in section 3
hence , the speed of water is largest in section 3
c)
Using equation of continuity
v1 * A1 = v3 * A3
v1 * pi * (2D/2)^2 = v3 * pi * (D/2)^2
v1 * D^2 = v3 * D^2/4
v3/v1 = 4
the ratio of speed in section 3 to section 1 is 4