The plunger and the needle of a hypodermic syringe have areas of 0.5 cm2 and 0.0006 cm2, respectively. To inject a vaccine, a nurse pushes the plunger with a force of 5.5 N. What pressure is transmitted to the vaccine
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
- The plunger and the needle of a hypodermic syringe have areas of 0.5 cm2 and 0.0006 cm2, respectively. To inject a vaccine, a nurse pushes the plunger with a force of 5.5 N. What pressure is transmitted to the vaccine?
- Suppose that a person afflicted with an aneurysm has an enlarged portion of the aorta with a cross-sectional area 50 percent bigger than normal. (a) What is the speed of the blood through this enlarged portion? (b) What is the pressure difference between the normal and the enlarged aorta? Assume that the speed of blood in the normal aorta is 40 cm/s and that the person is lying down.
Answer Keys:
- 1.1*105 Pa
- a) v = 0.27 m/s
b) vc = -46 Pa
(I know it's very unlikely of you to answer two questions at a single submission but I'm running out of questions left this cycle. Please help me out on this one. I'm completely stuck.)
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