Some important questions from Hydrostatics:
i.Why is it easier to lift a body in a liquid than in the air? ~We know that,
Upthrust =Density of fluid*acceleration due to gravity*Immersed volume of the body From the realtion above, it is clear that upthrust given by a fluid to a body is directly proportional to the density of the fluid. Also, as a matter of fact, the density of air is less than that of liquid. So, the liquid provides greater amount of upthrust than the air does. This implies that a body loses its weight greater in air than in the liquid. Therefore, it is easier to lift a body in a liquid than in the air.

ii.Steel balls sink in water but don’t sink in mercury. Why? ~ The density of the water is less than that of mercury. Also, the density of the steel is greater than that of water but less than that of mercury. Hence, mercury provides greater upthrust than water does resulting the floatation of the steel in it.

iii.A body floats in a liquid contained in a beaker. The whole system falls under gravity. What is the upthrust on the body due to liquid? ~When a container filled with a liquid falls freely under the influence of gravity, the following condition arises. Upthrust=mg-ma

Since the process is influenced by gravity,
ma = mg
So, upthrust=0N
Hence, it is conclusively proved that the upthrust on the body is zero.

iv.Why do bigger air bubbles rise faster than the smaller ones in boiling water? We know that,
Upthrust =Density of fluid*acceleration due to gravity*Immersed volume of the body Bigger air bubbles means greater volume and vice versa. From the above relation, Upthrust provided by a liquid is directly proportion to the volume of the body. Hence, the bigger bubbles experience greater upthrust than that of the smaller ones. As a result, they rise faster to the surface of the water.

...Lab Report
Question- Why do few objects float in water where as others sink?
Hypothesis- I think the objects that have a greater density than water will sink. So whichever object has a density more than 1g/cm³ will sink in water. This is known as relative density where the density of the substance is compared to the density of water. Hence, the object that has a greater mass: volume ratio than water will sink.
Materials-
* 1 measuring cylinder
* 1 rectangular prism
* 1 ball of plasticine
* 1 cylinder
* 1 cube
* 1 micrometer
* 1 vernier calliper
* 1 balance
Variables-
Independent- The object that was used
Dependent- The density of the object
Controlled- The water in the measuring cylinder
Procedure-
1. Get the 4 objects (rectangular prism, ball of plasticine, cylinder, and cube) that you’re going to experiment with.
2. Measure the mass of the rectangular prism by weighing it on the balance. Weigh it three times to get an accurate measurement. Then find the measurements of the length, width, and height using a vernier calliper. Use the formula l× b× h to find the volume. Divide the mass by the volume to get the density.
3. Measure the mass of the plasticine by weighing it on the balance. Weigh it three times to get an accurate measurement. Now fill up the measuring cylinder to a certain level and note it down. Next, drop the...

...MEASUREMENT OF PHYSICAL PROPERTIES: DENSITY
Introduction
According to the definition Density is the physical property that allows us to compare the mass of substances for a specific volume. In this Lab activity that took place in Deree College, Agia Paraskevi Campus we deal with the density of solids and density of liquids. The main purpose of this experiment is to understand what in reality density means, how we can measure it, how useful it is, what is the difference between density of solids and liquids, if the measurements that we did are been accurate and how we can calculate the percentage errors.
materials
3 different metals
A) copper
B) iron
C) aluminum
- 3 Different liquids
A) Water
B) Olive oil
C) Alcohol
- Balance
- Cylinders of 25ml, 100ml
- Calculator
DATA/RESULTS
In this Lab activity we saw the differences between the density of solids and the density of liquids.
Firstly we obtained three different solids a piece of aluminum, a piece of copper and a piece of iron, and we measured their masses by using the balance. Also, we measured their volume by using a cylinder with distilled water, then we have measured the volume, and then we put in the metal and recorded the total volumes. After that we calculated each density and we recorded the average density (by classmates)....

...purpose of the lab was to determine density of both regular and irregular shaped objects. Throughout the lab I found out that both of the small and large silver rod, do not have the same density, and also found out that the gold rod is not real gold.
My hypothesis is that since, the large and small silver rod has about the same density I believe that they would have about the same amount of volume. They both might displace the same amount of water on the graduated cylinder.
The Materials we used throughout the lab was:
Metal rods (Gold & Silver)
Wooden block
Water
Scale
Ruler
Graduated cylinder
Procedure thought out the lab:
1. First step we did was get the materials and went to out stations with our partners.
2. Second me and my partner measured the mass of the metal rods and the wooden block and recorded them on the worksheet.
3. After we filled up the graduated cylinder with water and dropped one of the metal rods and the water, the water amount that increased in the cylinder was the volume of the rode that was placed in.
4. We continued to measure and record the volume of each of the metal rods the same way as the first.
5. We measured the length, width, and height of the wooden block and recorded it. Then multiplied them altogether to get the volume of the block.
6. After gaining the measurements of the mass and volume of the metal rods and the wooden block, me and my partner then used both the mass and volume to...

...
Research:
The word density means the degree of compactness of a substance. There is density in everything in your everyday life (matter.)The formula to find density is d=m/v.The density of solids and liquids is usually stated as g/cm3, while gases are usually stated as kg/m3. A real life example of density would be that ice floats on water because it is less dense than water, or it sinks because it is more dense than water. The only substance that breaks this rule is ice. Archimedes was the first person to develop the idea of density, to find out if his crown was truly made of gold. He figures this out because he knows that the formula of density for gold is 19.3 g/cm3, and if a different type of metal was used, it would make the density higher or lower than 19.3g/cm3. In some cases, you can manipulate density. If you can change the weight or volume, the density will change because the formula for density has these variables. An example of this would be to make an aluminum foil boat, and place it on the water. It floats, because it is less dense than water. You then crumple up the aluminum foil, and it sinks because it is now less dense than water.This happens because you changed the volume, which is part of the density formula.
State
Material
Density
(g/cm3)
Solids
Gold...

...Submitted:
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Summary of Results
68% Correct of 25 Score d ite m s:
17 C orre ct: 8 Incorre ct: 32% 68%
More inform ation about scoring
1.
Which of the following is not a unit of pressure? Your Answer: poise
2.
Which of the following is a unit for Bernoulli's equation? Your Answer: J/m3
3.
What is an alternate unit for Bernoulli's equation? Your Answer: N/m3 Correct Answer: N/m2 Review Chapter 10 in Giancoli.
4.
Which of the following is not a unit for surface tension? Your Answer: J/m2 Correct Answer: J/m3 Review Chapter 10 in Giancoli.
5.
Which of the following is a unit of density? Your Answer: kg/m3
6.
One kilogram of iron (density ~7.8 gm/cm3 ) and 1 kilogram of aluminum (density ~2.7 gm/cm3 ) are dropped into a pool. Which has the largest buoyant force on it? Your Answer: Aluminum
7.
One cubic centimeter of iron and 1 cubic centimeter of aluminum are dropped into a pool. Which has the largest buoyant force on it?
1/8
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11/11/12
Fluids
Your Answer: Both are the same.
8.
One gram of iron and 1 cubic centimeter of aluminum are dropped into a pool. Which has the largest buoyant force on it? Your Answer: Aluminum
9.
One gram of oak (density ~.8 gm/cm3 ) and 1 gm of aluminum are dropped into a pool....

...Density: Using Experimental Techniques to Solve an Inquiry based problem
ABSTRACT
The topic of this experiment is Density. The objective is to find two ways in which the density of a given object can be determined, and to find out which of the two ways is more accurate and hence better to use in such a case. The two methods used in this experiment are finding the dimensions of the object and water displacement. These are two ways of finding the volume of an object, and they were chosen since the density of an object may be found using its mass and its volume. The experiment yielded two different density values, however when error analysis was conducted, the water displacement method was proven to be more accurate.
INTRODUCTION
Density by definition is the measure of the amount of matter contained in a substance per unit volume of that substance. This tells how compact the matter in the substance is. Density is very important in everyday life as mass and volume alone are not good enough in comparing different substances or objects. For example, 10 kilograms of cotton and 10 kilograms of iron would definitely have the same mass (10 kilograms) but the cotton would have an extremely larger volume than the iron because the matter contained in iron is more closely packed, and thus it will occupy less space than that of the cotton. Density has become the key to...

...help students analyze and determine the density of various objects. Also, this lab helped students to become more confortable with the use of the different instruments to determine the densities.
Questions:
1) There were a few major sources of error. One source of error is the inaccuracy of a human. The calculations provided by a person, may not have been exactly accurate. Another source of error was that the objects given to us may have not been exactly in the best shape. Since other classmates used these objects various times, things, such as a minor crack in the glass, or a dent in the cube could have varied the calculations. Both of these errors may have affected the densities.
2) The Unknown liquid 11 had the density of .750 grams/cm cubed. The closest liquid to the unknown liquid 11 is Ethanol because it has the density of .789g/cm cubed.
Conclusion:
The purpose of this lab was to help students analyze and determine the density of the objects presented. Also, this lab helped students to become more confortable with the use of the different instruments to determine the densities. According to the data chart, solids being irregular and regular contain similar densities. Also the liquids have similar densities. The lab also showed the similarities between the density of a solid and the density of...