A submarine has a large ballast tank, which is used to control its position and depth from the surface of the sea.

A submarine submerges by letting water into the ballast tank so that its weight becomes greater than the buoyant force (and vice versa). It floats by reducing water in the ballast tank.-thus its weight is less than the buoyant force.

2. Hot-air balloon

The atmosphere is filled with air that exerts buoyant force on any object.

A hot air balloon rises and floats due to the buoyant force (when the surrounding air is greater than its weight). It descends when the balloon weight is more than the buoyant force. It becomes stationary when the weight = buoyant force.

The weight of the Hot-air balloon can be controlled by varying the quantity of hot air in the balloon.

3. Hydrometer

A hydrometer is an instrument to measure the relative density of liquids.

It consists of a tube with a bulb at one end. Lead shots are placed in the bulb to weigh it down and enable the hydrometer to float vertically in the liquid.

In a liquid of lesser density, a greater volume of liquid must be displaced for the buoyant force to equal to the weight of the hydrometer so it sinks lower. Hydrometer floats higher in a liquid of higher density.

Density is measured in the unit of g cm-3.

4. SHIP

A ship floats on the surface of the sea because the volume of water displaced by the ship is enough to have a weight equal to the weight of the ship.

A ship is constucted in a way so that the shape is hollow, to make the overall density of the ship lesser than the sea water. Therefore, the buoyant force acting on the ship is large enough to support its weight.

The density of sea water varies with location. The PLIMSOLL LINE marked on the body of the ship acts as a guideline to ensure that the ship is loaded within the safety limit.

A ship submerge lower in fresh water as fresh water density is...

...Archimedes’ Principle
Abstract
The purpose of this experiment was to investigate the Archimedes’ Principle for objects of different densities and use the principle to determine the density of a golf ball. The weight of rubber stopper and the wood cube were measured in the air by using the force sensor. When the objects were submerged in the water, the apparent weight of the objects was measure with the force sensor and the volume of the displaced water were measure with a graduated cylinder. These same procedure was used to obtain weight and apparent weight of the golf ball. The weight of the displaced water when the rubber stopper was submerged was 1.94 N. Buoyant force obtained was 1.96 N and 2.14 N with a percent discrepancy of 0.97% and 9.30% respectively. The weight of the displaced water by the object was 1.14 N. The buoyant force was 1.14 N and 1.24 N with a percent discrepancy of 0.0% and 8.39%, respectively. The density of the golf ball was 1201.50 kg/m3. The theoretical values of the golf ball was 1130 kg/m3. The percent discrepancy was 6.19%. The percent discrepancy between the predicted mass and the experimental mass of the beaker, water, and golf ball was 0.056% which indicates an accurate prediction. The objective of the experiment was successfully met, investigators were able to confirm that the object is buoyed up by a force equal to the weight of the water displaced by the...

...
Archimedes’ & Pascal’s Principle
Purpose
In this lab, we will prove Archimedes’ Principle by finding the density of a Metal Cylinder, a cork, and an unknown fluid by using Archimedes’ Principle. We will also use the PASCO Pascal’s Principle Lab Setup to investigate the use of fluid pressure as a hydraulic system to do work and we will find its mechanical advantage.
Procedure
For the first part of the lab we will be verifying case 3 as explained by professor. We will measure the mass of the metal cylinder using the digital balance. After measuring the mass we also gather the diameter and height using the vernier caliper to calculate its volume. Using the mass and volume, we calculated its density.
Now a beaker was filled with water and the mass was measured. The cylinder we originally used will now be suspended in the beaker full of water and the change of mass will be recorded. The difference between these gives the Buoyant Mass of the cylinder. Using formulas provided the actual density of object was calculated as well as the apparent mass in water. Next we verified the situation in case 1. The big and small diameters of the cork were measured and then the density was calculated. Same process again, the cork will be suspended in the beaker that was full of water and we measured of how of it went in the water. The percent error was...

...Philippines
EXPERIMENT NO. 1
ARCHIMEDESPRINCIPLE
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ArchimedesPrinciple
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Abstract:
* -------------------------------------------------
Sophomore students from Occupational Therapy in De La Salle Health Sciences Institute had conducted an experiment concerning Archimedes’ Principle to determine the density of solids and liquids using Archimedes’ Principle. For the density of solids, they had made use of spring balance to measure the mass of the metal samples, which were tied via string, in air and when immersed inside a 2000mL beaker, where H2O lies. They had computed the density of each sample metal using the formula: ϱs = maϱw / ma - mw and computed a percentage error. As for the density of liquids, they had filled a graduated cylinder with 250mL liquid sample and had immersed a hydrometer. They had immersed a sample metal in the liquid sample and had measured its mass in air and beneath the liquid. They also had measured the volume of displaced liquid as the metal sample is immersed in the liquid and had computed the density using the formula: ϱL = WaWL / gV, and the percentage error after. They had been successful to support the theory of Archimedes and had came up with percentage error ranging from 5.76% to 9.91%.
Introduction:...

...Physics 141 Archimedes --1
ARCHIMEDES’ PRINCIPLE AND SPECIFIC DENSITY
GOAL: To investigate buoyant force and Archimedes’ principle. To measure the specific density of several materials. INTRODUCTION: Try pushing down on a basketball in water and you feel the buoyant force that makes the ball float. As more of the ball is pushed beneath the water, the upward force becomes greater. One could make a first guess (Hypothesis #1) that the buoyant force increases with the submerged volume of the object. A more mathematical guess (Hypothesis #2) might be that the upward or buoyant force, B, is proportional to the submerged volume, Vsub, of the object. feathers, is in fact a statement that the density of lead is greater than the density of feathers. Recall for a homogeneous object with a volume, V, and a density, D, has a mass, m:
(4)
Thus the statement that lead is heavier than feathers, is correct if equal volumes of the two materials are compared. For many practical applications, it is important to be able to compare densities of various materials. One could compile a list that compares the density of everything to density of everything else, but it is easier to compare the densities of everything to just one substance, water. Water is chosen because it is very readily available and is frequently used in the measurement of density. One defines for a material with a density, Dk, a specific density, sk...

...
LABORATORY REPORT SUBMISSION
Experiment Title
:
ArchimedesPrinciple
Due Date
:
13 Nov 2014
Lab session
:
Group C
Group
:
03
STUDENTS DECLARATION OF WORK
We declare that the work submitted is our own. We confirm that we have read and understood the University regulations with regard to Plagiarism, Collusion and Cheating in this work will be penalized.
No.
Student ID
Group Members
Signature
1
1001336124
Rafat Saifullah Joy
2
1001025540
Liew Jian Huei
3
1001233272
Mustafa Maan
4
1001232603
Al faqeeh Ali
5
1001438732
Wah Jia Kai
6
1001437466
Cheng Wy - Liang
LECTURER’S ASSESSMENT CRITERIA
Criteria
Wtg.
Mark
Title, Objectives & Introduction
4
Materials and Methods
2
Results
3
Discussion & Conclusion
5
References
1
TOTAL:
15
Title: ArchimedesPrinciple
Objective:
To determine the density of an object more dense than the water by using ArchimedesPrinciple.
Introduction:
Archimedes’ principle states that for anybody partially or completely submerged in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the body. The weight of an object acts downward, and the buoyant force provided by the displaced fluid acts upward. The fluid displaced has a weight W = mg. The mass can then be expressed in terms of the density and its volume, m = pV where density of an object, p...

...Title: Density, Alcohol Content and the ArchimedesPrinciple
(Performed 09/11/13)
Report submitted by:
Purpose: Part I was to examine three different objects of the same material in order to identify the type of metal. We used the water displacement method and the buoyancy method according to ArchimedesPrinciple. Part II was to find the density of ethanol by mass. We used a 25.0mL graduated cylinder and a 25.00mL volumetric flask to measure the volume. We used two different pieces of glassware to determine the most accurate density of ethanol by mass since the measurement of volume is variable.
Procedure: As stated in lab manual pages 23-24.
Data and results for part I: Density and identification of a solid:
Calculated Density Using the Water Displacement Method
Mass of object (g) Initial volume (mL) Final volume (mL) Volume of object (mL) Density (g/mL)
Trial 1 17.635 61.9 64.0 2.1 8.4
Trial 2 21.707 71.9 76.0 4.1 5.3
Trial 3 16.755 67.8 69.8 2.0 8.4
d=m / V
Trial 1: d= 17.635g/2.1mL = 8.4g/mL
The average of the calculated density: 7.4g/mL
The calculated standard deviation: 1.8
We identified the metal as Zinc (7.14g/mL). However we believe the calculated density of trial 2 seemed inconsistent with the other two trials. Therefore we believe that the metal is actually yellow brass (8.47g/mL).
The percent error: - 13%...

...Measurement of Mass, Volume, and Density through
ArchimedesPrinciple
Overview:
The purpose of this experiment was to measure the density of a solid and a liquid using Archimedesprinciple. Archimedes is one of the greatest inventors and mathematicians of all time. The principle we used in this experiment was discovered when Archimedes stepped into a full bath tub. UsingArchimedesprinciple, we were able to determine the density of a lead rod, water, and an unknown liquid.
Physical Data:
Name | MW (g/mol) | ρ (g/cm3) | bp (˚C) | mp (˚C) |
water | 18.01 g/mol | 1 g/cm3 | 100 ˚C | 0 ˚C |
lead | 207.2 g/mol | 11.34 g/cm3 | 1749˚C | 327.5˚C |
Equations:
Spring ConstantF=-kxThe equation was used to calculate the spring constant of spring i. | Densityρ=massvolumeThis equation was used to calculate the density of an object. | Buoyant ForceB=Δmg=ρf VobjgThis equation was used to calculate the buoyant force of an object. |
Experimental Procedure:
ProcedureA: * Setup similar to the spring constant lab * Use the same or a similar spring from the spring constant lab * Find the spring constant of the smallest spring used from previous lab if not already foundB: * Use the same metal rod from the Error of Propagation experiment and attach it to the bottom of the spring * Fully submerged the metal rod in a beaker of water * Record...

...Archimedes Background/Upbringing
Archimedes was one of the most known and respected mathematicians of ancient Greece. He was born between the years of 290 and 280 BCE in Syracuse, Sicily which is currently known as Italy. His death took place in Syracuse, Sicily between the years of 212 and 211 BCE. In autumn of 212 or the spring of 211 Syracuse was taken over by Roman General Marcus Claudius Marcellus (Encyclopedia Britannica, n.d). It was during the cities take over that Archimedes was killed. There is rumors about what lead up to a Roman solider killing him. Some historians believe his death was due to Archimedes not willing to give up his mathematical diagrams of mirrors that would burn the Roman ships. The exact years of his birth and death are uncertain, but Greek historian John Tzetes believes he lived to be 75 years old (“Archimedes”, n.d). Archimedes father was named Phidias who was an astronomer. His mother’s name is unknown, but there is belief that Archimedes is related to the Ruler of Syracuse King Hiero II. There are currently not many documents of Archimedes upbringing. In fact there is only one record of his life that was written by his friend Heracleides. Unfortunately this biography was lost.
Education
Archimedes was not only a mathematician but also a physicist, engineer, inventor, and astronomer...