HW1.4

Homeword 1 Problem 4

//Main Point: You need to know the definition of Flow rate. You also need to know how to convert from cm to in.//

1 in = 2.54 cm

Qin = Qout

Qin => Flow rate at plunger Qout => Flow rate at tip of the needle.

Q=vA

v,plunger = Q/A,plunger = 0.829 in/s


 * Note: A lot of problems in BMED 3300 give the cross sectional information in terms of diameter. I find it is best to keep it as it is given in the problem. Therefore I solve for A=π/4*D^2. You will find this to be time saving eventually but also frustrating at first because most people are used to being given the radius of a circle in lieu of a diameter.