Fluid Mechanics #8 Help please, you can see my previous submissions. (7%) Proble

Question

Fluid Mechanics #8

Help please, you can see my previous submissions.

(7%) Problem 8: The pressure drop along a length of artery s 96 Pa, the radius is 12 mm, and the flow is laminar. The average speed of the blood is 15 mm/s. Randomized Variables P 96 Pa -12 mm s-15 mm/s 50% Part (a) What is the net force on the blood in this section of artery in 50% Part (b) What is the power expended maintaining the flow in mw? ? P 0.0006514 Grade Summary Deductions 9% 91% 789HOME Submissions Attempts remaining: 2 (3% per attempt) cotan0asin acos0 atan0 acotan inh0 cosh0 tanh cotanh0 Degrees Radians detailed view 13% 3% 3% END VO? BACKSPACE | DEL| CLEAR Feback give upl Submit Hints: 3_ for a 0% deduction. Hints remaining: O Feedback: 0%-deduction per feedback. How is force related to power? What other quantity besides force might the power depend on? Force has units of kg m/s, and power has units of kg m2s3 (energy per second), so what units do you have to multiply by to get from force to power? Submission Histor;y All Date times are displayed in Pacific Standard Time.Red submission date times indicate late work Answer Hints Date Time Feedback Note: Feedback not accessed 1 Jul 29, 2018 2:27 PM P- 0.00065 129, 30153 227 P11 43 33P 2:27 PM P 0.0006 3 Jul 29, 2018 2:28 PM How is force related to power? Note: Feedback not accessed. 0.00065145 -What other quantity besides force might the power depend on? PForce has units ofkg m/s2, and power has units of kg m/s3 (energy per second), so what units do you 6.515E-4 have to multiply by to get from force to power?

Explanation / Answer

(a) area of artery=pie r^2

= pi x (0.012)^2=0.0004524 m^2

pressure=force/area

=> force = pressure*area

=> force = 96 x 0.0004524 = 0.0434 N

(b) power= force x velocity

= 0.0434 x 0.015

= 6.514*10^-4 W

= 0.6514 mW

(you have the correct number but they want the answer in mW, so you need to multiply by 1000)

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