Question

5 mL syringe has an inner diameter of 10 mm, a needle inner diameter of 0.25 mm, and a plunger pad diameter of 1.5 cm. A doctor uses the syringe to inject medicine into a patient whose blood pressure is 140/100 (assuming ideal fluid).

a) What’s the minimum force that the doctor needs to apply to the syringe?

b) The syringe is emptied in 3s, what was flow speed?

Answer 1