experimental, report paper

experimental, report paper

Format of Repots:
1. Literacy internet search is important to do these experiments. Please, provide your links/references.
2. 2-3 pages for report are sufficient.
3. Conclusions and/or explanations of what you have seen while providing experiments are mandatory in your reports. If your experiment involves measurements, please, provide your data.

1. Terminal Velocity of a Soap Bubble
What is terminal velocity? Based on literacy search discuss this concept.
Perform an experiment to proof that terminal velocity for a soap bubble is usually being reached practically immediately after releasing of a soap bubble.
Measure this velocity (approximately) using your wrist watch and ruler.
Perform the same experiment for an air-filled balloon. What conclusion can you make now?

2. Liquids and Gases.

1. Prepare a glass with water and a needle (the thinner the better). Very carefully place the needle on the surface of water. You may need to use a small piece of paper tissue for this. Why is the needle floating?
Carefully add into water small amount of liquid soap. What do you see and what is your explanation?
Discuss phenomena which you have observed, confirm it with proofs from literacy search.
2. For this part, you need a balloon and a pitcher or some other container. Its easiest if the container is transparent enough to see the level of water in it from the outside.
1.Inflate the balloon to a point where it will fit completely inside the pitcher, but with some place around it and below it. Dont inflate it fully: it should be able to expand!
2.Slowly fill the pitcher with cold top water, holding balloon down, until the pitcher overflows. Hold balloon completely submerged for a couple of minutes, adding more water if necessary to keep the pitcher full. Remove balloon and mark the level of the water.
3.Repeat #2 using warm or tolerably hot water. Is the water level after removing of the balloon the same in both cases? Why?

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3. Exploring Wal*Mart (to be done in the nearest Wal-Mart).

Perform literacy search to understand what is focal length of mirror (lens) and how you could measure it.
1.Find a stand with shaving mirrors and make-up mirrors in WalMart or a Pharmacy near your home/dorm. Measure (you do not need any equipment for this, only ruler) the focal distance for two different mirrors of your choice. Describe how are you doing this. Do these mirrors have long or short focus and how can you explain this?

2.For the second Lab you need a stand with reading glasses. Measure the focal length of two or three pairs of reading glasses (again, you do not need any equipment here). My advice: take the glasses with labels +3.0D; +4.0D it is easier to measure. Find the correspondence (relationship) between units D, written on glasses, and focal length in meters. To what focal length F corresponds 1 D, according to your measurements?

3. For the last one, go to a stand with sunglasses. Pretend that there are no labels polarized and perform an experiment to check, if these glasses are or are not polarized. Describe your observations and what you are doing. Somewhere around there should be also a stand with electronic wrist watches. Using the same method as for glasses, determine if the face of the electronic watch is polarized. Is it? Explain what allows you to make your conclusions.

4.Echos and the Speed of Sound

Perform literacy search to understand, what kind of difficulties you may expect measuring speed of sound (hint: speed of sound is pretty big in comparison to everyday speeds). Discuss methed which you are going to use.
Place yourself far enough away from a large building with flat sides, so that you hear a noticeable echo when you strike a board loudly with a hammer. A building surrounded by a huge parking lot with no cars, as in a shopping mall early in the morning, is ideal. Since the echo returns a fraction of a second after striking the board, the elapsed time is difficult to measure accurately with a stopwatch. Here is a procedure for measuring the travel time of the sound which may give more reliable results: Strike the block of wood at a steady rate, carefully adjusting the rate so that midway between each pair of bangs you hear the echo: bang, echo, bang, echo, bang, echo, Once you have found the right rhythm, measure the total time for a convenient number of bangs, and use it to determine the time between bangs. For example, if you start the stopwatch on bang 1 and stop it on bang 11, the time between bangs is the total time divided by 10. How is the travel time of the sound to the wall and back related to the time between bangs? Measure your distance from the reflecting side of the building. From this information determine the speed of sound, explaining your calculation in detail.

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Note: If there are several nearby buildings, the experiment is difficult to interpret, since each building contributes an echo. On the Temple campus, Parking Lot 1 on the west side of Broad Street, opposite the Baptist Temple, is free of cars, on the weekend. Standing near the north edge of the parking lot, close to the Student Pavilion, one can hear a clear echo of a hammer blow coming mainly from McGonigle Hall to the south. There are also echoes from sound that travels to the Student Pavilion, is reflected, and then travels back to the starting point, and from sound that is first reflected from the Student Pavilion and then from McGonigle Hall before travelling back to the starting point. The interpretation of the experimental results is simplest if one stands right next to the Student Pavilion on the south side of the building while striking the board or if one stands midway between McGonigle Hall and the Student Pavilion. Why?
5. Balance a Dinnerware hefty steel FORK and a SPOON combination with a tooth pick on the edge of a glass half-filled with water.
This is an astonishing demonstration of the stability of a system with the center of mass above its base of support.
1.Push the spoon in the middle prongs of the fork till it grabs and holds it firmly.
2.Insert one round toothpick in the middle prongs of the fork till it is held tight.
3.balance the combination with the toothpick over the side of the glass. I myself was astonished when I did it first time.
Do the same experiment with an empty glass (Chose a hefty glass, not any plastic one)
Where roughly is the center of mass of
i) the fork and spoon combination
ii) the glass
iii) the combination of spoon and fork when balanced on the edge of the glass.

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1. b) The above principle applies for the leaning tower at Pisa to be stable. Dig out the the information on Leaning Tower at Pisa using Internet Resources; it”s repairs pertinent to it”s stability.

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