ThomasMartin_Lab7
docx
keyboard_arrow_up
School
National College, Princeton *
*We aren’t endorsed by this school
Course
159
Subject
Geography
Date
Feb 20, 2024
Type
docx
Pages
4
Uploaded by CorporalSheep635
Name: Thomas Martin
E-mail address: Tmarti65@vols.utk.edu
Laboratory 7 Report
●
Show your spreadsheet entries from part I and part II. ○
Entry I
W
c
W
o
W
ow
W
cw
W
w
F
b
(F
b
-W
w
)/F
b
Object 1
0.42
2.64
2.32
0.72
0.3
0.32
6.25
Object 2
0.42
3.42
3.07
0.71
0.29
0.35
17.14285714
Object 3
0.42
2.4
2.09
0.69
0.27
0.31
12.90322581
Object 4
0.42
0.88
0.57
0.71
0.29
0.31
6.451612903
○
Entry II
○
Mo
mw
Vw
Po
0.26938
8
0.03061
2
3.06E-
05
8800
Brass
0.34898
0.02959
2
2.96E-
05
11793.1
Lead
0.24489
8
0.02755
1
2.76E-
05
8888.88
9
Brass
0.08979
6
0.02959
2
2.96E-
05
3034.48
3
Aluminu
m
●
Answer the following questions:
According to Archimedes' principle, the buoyant force is equal to the weight of the displaced fluid. Do your experimental results verify Archimedes' principle? Comment on your results.
○
No they do not as the buoyant force for all of the objects was very similar to the weight of the displaced fluid for my results, with the highest difference being only 17% in my case.
○
Do your experimentally determined densities of the various materials agree with the densities given in the table? Comment on your results.
■
Yes they do although my density for aluminum was a bit higher than the given density it was still easily distinguishable. ●
As the pressure sensor is moved deeper into the liquid, how does the pressure change?
○
As the sensor is moved deeper in, the pressure increases. ●
As liquid is added or removed from the basin, how does the pressure near the
bottom of the tank change?
○
When liquid is added to the basin, the pressure will increase near the bottom of the tank. If liquid is removed the inverse is true and the pressure will drop.
●
How does the pressure in the water change when the atmosphere is removed?
○
Whenever the atmospheric pressure is removed 1 atm the pressure under the water is what it would normally be just minus 1 ie if the pressure at the bottom was 1.245 the pressure without the atmospheric pressure would .245 so essentially removing the atmospheric pressure drops the pressure under water significantly.
●
Keeping all other conditions the same, does the pressure a given distance below the surface depend on the shape of the basin?
○
No, the shape of the basin does not affect the given pressure at any depth.
●
How is the density of the fluid related to the pressure it exerts?
○
Higher density fluids will apply a higher pressure on the sensor than a lower density counterpart. For example honey has a pressure of 1.4 atm at the bottom of the basin while gasoline has a pressure of 1.2 at the bottom of the basin.
●
How does increasing gravity change the pressure in the fluid?
○
Increasing the gravity, significantly increases the pressure acting on the sensor.
●
When g = 9.8 m/s
2
, how does pressure (in Pa) change for each meter of water
depth?
○
Each meter further into the water results in an additional pressure of 10 Kpa or approximately 10000 Pascals.
●
i) Lay your hands on the table in front of you and locate a bulging vein. Slowly raise your hand until it is well above your head while constantly watching that vein. What happens? What height above your shoulders do you first notice a change? Describe your observations.
○
As I begin to raise my hand the vein begins to recede until it is no longer bulging at around a foot above my shoulder is when it begins to recede
Slowly lower your hand while still watching the vein. Repeat the process. Do you have an explanation for your observations?
■
I would say that the pressure being applied to the blood in my veins is decreasing flow rate whenever I raise my hand and that is why the vein recedes while raising my hand and reappears when I lower it. Secondly I believe that 1 foot is approximately the head pressure on the blood flow, and that is why after 1 foot
above my shoulders it begins to recede.
●
(i) Lay two thick books about 10 cm apart. Place a sheet of paper on the books so that it bridges the gap between them. Try to blow the paper off the books by blowing underneath it. Describe what happens. Do you have an explanation for your observations?
○
I was unable to blow the paper off the books, I would attribute it to the small amount of surface area that is available for me to apply pressure
to, hence not allowing the blow the rather light paper away.
●
Hold two sheets of paper vertically about 5 cm apart. Blow the sheets apart by blowing hard between them. Describe what happens. Do you have an explanation for your observations?
○
The sheets of paper would frequently fall forward, I believe this is because the force I was applying with my breath was in the forward direction. Thereby causing the sheets to follow that path. ●
Hold a straw upright in a glass of water so that the top of the straw projects over the top of the glass. Place a second straw perpendicular to the first so that the end of the second straw is almost touching the opening of the first, but is not blocking it. Blow hard through the second straw. Describe what happens. Do you have an explanation for your observations?
○
I can notice a minute amount of air coming out of the second straw, however, I would assume that most of the air is not making it to the second straw even if I blow as hard as I can. I am unsure what the dynamics behind the airflow in this situation would be, however, I can assume that most of the air is lost in the gap between the 2 straws. To test this theory I did hold the straws further together and saw significant differences between the two tests. ●
In one or two sentences, state the goal of this lab.
○
I believe that the goal of this lab was to give us a more realistic application of Archimedes’s principle, and to give us more practice calculating the different components of an unknown object given its weight and displacement in Newtons. ●
Make sure you completed the entire lab and answered all parts. Make sure you show your work
and insert and properly labeled relevant tables and plots.
●
Add a reflection at the end of your report in a short essay format.
○
Overall I truly enjoyed this lab, my experience with excel has steadily improved, hence allowing me to enjoy the calculations and theoreticals
behind this lab without having to worry as much about the deadline on the assignment. As well as the simulation for this lab, it was very interesting and informative to be able to experiment with different aspects of what makes up pressure underwater. The negative comment about this assignment was that 2 labs in a span of 3 days was a bit tough. I was able to get started early on lab 6, however,
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
having 2 days for Lab 7 was a bit tougher than expected, however,That
is all.