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A catheter is a specialised needle intended for long-term insertion into a vein in a patient's arm. Engineers are redesigning them to cause less discomfort and damage. An intravenous chemotherapy system is based on a new catheter design. A liquid drug flows to the patient from a plastic bag via through a smooth plastic tube. The liquid drug completely fills the tube at the start of the procedure. The bag is at atmospheric pressure and it is 0.75 m vertically above the catheter. The tube is 2 mm in diameter and 2.0 m long. The average blood pressure in the vein is 6500 Pa gauge. The density of the liquid drug being supplied is 1020.4 kg/m3 and its dynamic viscosity is 2 x 10-3 Pa.s. Exactly 314 mL of the drug must be supplied. In a laboratory experiment, you measured a fitting head loss for the catheter equivalent to 0.068 m of the liquid drug.(a) What is the key assumption you must make to do this problem?(b) How long will it take to supply the required amount of drug?(c) Show by calculation that the key assumption you made was correct
Find the Temperature of the Refrigerant, A closed vessel with a volume of 2 ft^3 contains 5 lb of Refrigerant 134a. A pressure sensor in the tank wall reads 71.39 lbf/in.^2 (gage).
Estimate the minimum bar diameter to prevent fatigue failure.
a gear of mass 2.5kg rotates ar 1500rpm.due to an error in manufacture the centre of gravity of the wheel is displaced 0.5mm from the axis of rotation. calculate the out of balance force.
calculate the maximum permissible crack size in acenter cracked panel subjected to a unifrom stress of 20 ksi. the toughness is 50 ksi"in, the yield stress is 60 ksi, w=12 inches
Analysis of the motion of swing including velocity and acceleration plots of all moving parts and projectile analysis of projectile eg: flight path, horizontal distance, deceleration and launch velocity
Estimate the theoretical fracture strength of a brittle material if it is known that fracture occurs by the propagation of an elliptically shaped surface crack of length 0.16 mm and that has a tip radius of curvature of 0.002 mm when a stress of 1..
A stationary gas turbine power plant operates on a simple ideal Brayton cycle with air as the working fluid. The air enters the compressor at 95 kPa and 290 K and the turbine at 760 kPa and 1100 K. Heat is transferred to the air at a rate of 35,00..
What kind of metals are often recommended for use at low temperatures, particularly when any sudden loading of the part is expected?
How do I calculate isentropic efficiency of a steam turbine when I know the inlet and outlet conditions?
Air at 250 kPA and 15C is being forced into a tire, which has a volume of 0.5m^3, at a velocity of 60 m/s through a 6 mm opening. Find the rate of change of the density in the tire.
determine the smallest allowable value of the coefficient of static friction between the collar and the rod if the collar is not to slide when a) a =15° b)a = 45°. Indicate for each case the direction of the impending motion.
Calculate the pressure of 15.0g of methane gas in a 1.50L vessel at 45.0 degrees C using (a) the Ideal Gas Law and (b) the van der Walls equation using the following information about the constants, a and b: a = 2.253 and b = 0.04278.
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