- #1
Derek1997
- 63
- 1
Homework Statement
Jane, a vet, is trying to sedate a dog by injecting him with sedative in a hypodermic syringe that
has a needle 20mm long with internal diameter 0.4 mm. The vet wishes to inject the dog with
3 ml of anaesthetic that has viscosity 4 x10^-3 Pas. Since the dog is struggling hard, she needs
to get it into his bloodstream within 1 second.
(a) How much pressure needs to be applied to the fluid in the syringe barrel to achieve this
rate of flow through the needle?
(b) Explain why this is pressure is not absolute, but is relative to atmospheric pressure.
(c) If the barrel of the syringe is 10mm in diameter, what force does Jane need to apply to the
plunger to achieve the needed flow rate
Homework Equations
Poiseullie or Bernouli
The Attempt at a Solution
Hi there, I'm stuck at this question. I don't know if I should use pensoulli's equation or bernoulis! Well the question did ask how much pressure, but idk how to tackle this question :( I'm seeking advise please[/B]