Copy of 5BL Lab 3 Assignment Submission Template - F23v3
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University of California, Los Angeles *
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Course
5B
Subject
Aerospace Engineering
Date
Jan 9, 2024
Type
Pages
6
Uploaded by BarristerDinosaurMaster1059
5±!L !Lab 3 ²ssignment
aylynn, ²shley, and Sama, 8/23/23, !Lab Section °1, ±ench
#10
<URNK] SPVS]VSkjURNKLI ALILIVS]TQ x_nmpj jNKkjfg_]kjNKkj _] NKAJUR kj[VSLINK kjAsruNK mlURVSkj Akj A +±" SPVS[NK A]LI nmpfg[_ALI VSml ml_ x_nmpj
#jALINKkjJ_fgNK AkjkjVSTQ]\NK]ml
°
1. ³reate a
lDLa[aQK
that gives blood pressure readings for all the members of your group above, below, and at heart
level, and
MGe_e_b\bb\bQKc]c]l
on the results.
±QKpjMGoiYSYLQK
any trends observed and discuss why (or why not) patient blood
pressure readings should be taken for > 1 trial.
-/eight
2aylynn
&&(shley
Sama
&&(bove -/eart
$ ±²!# mm-/g
³´±²!± mm-/g
³µ" ²# µ mm-/g
-/eart /evel
$ µ²" µ mm-/g
$ # ²!$ mm-/g
³°³²" " mm-/g
'')elow -/eart
" ² ³ mm-/g
# µ²!± mm-/g
³³" ²# µ mm-/g
When the blood pressure is measured above heart level¶ blood pressure increases·
When the blood pressure is measured below heart level¶ blood pressure decreases· The
height of the 0V drip has a direct relationship to the gravitational pressure on the blood
flow as it flows downward throughout the body and to the heart· ,.ravitational pressure is
needed for the fluid to flow downwards¶ but too much pressure can make blood pressure
abnormally high·
µ
2. ´escription of your experimental setup & labeled image/sketch for activity 2.
+oiQKOIYSYMGl
how water height and
pressure measured below the surface are related.
³· Tall cylindrical tube as pictured is filled with !´ cm of water· 0t is then appropriately connected
to the pressure sensor¶ and a faucet that lets out the water in relation to the internal pressure· &&(
switch is turned to open the faucet and let the water out·
°· Water height has a directly proportional relationship with the absolute pressure equation·
Thus¶ 3 or absolute pressure equals the density of the water ¸ρ¹ multiplied to the gravitational
force ¸g¹ and height of the water ¸h¹¶ added to the atmospheric pressure of ³´^ 3a ¸p
´
¹· ¸3 (""$
ρgh º p
´
¹· Ultimately¶ as the height increases¶ so does the pressure¶ and vice versa·
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3. a) Record the average pressure (
Δ
ml
≥
10 sec
for each water level) in this data table.
c) ²nalyze your graph and relate your results to the model P = P
0
+
༸
gh. Why doesn’t your best-fit line run through
the origin? ²t h = 0, what is the pressure?
Pressure does not equal zero because there is atmospheric pressure to consider. Thus, at h = 0, pressure is 100 kP².
b) Plot average
+
vs.
UR
with the line of best fit.
µnclude legible axis labels and units.
±
-/eight ¸cm¹
3ressure ¸k3a¹
!´
³´±·"
´
³´±·³
±´
³´µ·³
µ´
³´°·³
°´
³´³·´
4. a) ³ompare your experimental results to your prediction in Slide 2.
Yes our experimental results reflected our predictions in slide 2! When we were at a higher height, the water
pressure was higher, but when we were at a lower height, the water pressure was lower. Thus, our prediction that
at higher heights, the blood pressure would be higher is directly reflected. Specifically, we can see that at 60 cm we
had a pressure of 104.7 kPa, but at 20 cm we had a pressure of 104.1 kPa. ²s we mentioned in the 3rd slide, height
has a directly proportional relationship with the pressure.
b) ´iscuss sources of error (and which error(s) you think is/are most likely and why). ¶ow could you estimate the
sizes of your errors/uncertainties?
Some sources of errors include: not making the water’s height intervals (exactly 10 cm difference) for the data
collection equal at every point; not releasing the faucet switch at the same rate; not having the tubes fully
enclosed, and letting water or air leak out; and other empirical data mistakes. We would estimate the size of our
errors/uncertainties by using the %yield equation where we divide the actual value of data we got over the
theoretical yield value.
!
5. a)
+
vs.
UR
for µV bag positions (data table)
b) ³ompare your results to your group’s prediction(s)
These results match our prediction that when the µV bag is below the arm, blood pressure decreases, and when it is above
the arm, pressure increases, in comparison to measuring the pressure when the arm and µV bag are at the same height.
c) ²ctivities 1 vs. 3: are your observed trends the same or different?
¶eight and pressure are directly related. With greater height comes a greater influence of gravitational pull on the liquid.
Thus, when the source of liquid (µV bag) is higher than the arm, the pressure is higher. ²nd when the height of water in the
tube is higher, the pressure is greater.
d) What about the blood pressure monitor from activity 1 may have led to inaccurate readings in the high and low
measurement positions? Which pressure measurement device is more accurate, and why? ¶ow could you modify this
procedure to make the results more accurate?
µnaccurate measurements during the first activity may have resulted from arm movements occurring both below and above the heart. This issue arises
because there is no stable support, like a table, to keep the arm stationary. These inadvertent movements, caused by not maintaining complete stillness, have
the potential to adversely impact blood pressure readings. The wrist cuff, on the other hand, is considered more precise due to measurements taken during
the second activity. Potential inaccuracies can arise in this scenario due to the inherent human errors associated with making multiple measurements,
particularly when relying on visual estimation. To enhance the accuracy of the first activity, it is advisable to immobilize the arm both below and above heart
level, such as by placing it on an elevated surface throughout the entire blood pressure measurement procedure.
-/eight ¸cm¹
3ressure ¸k3a¹
µ´ cm above 0V
bag
³´´·#
0V bag /evel
³´°·#
µ´ cm below 0V
bag
³´±·±
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