Tuesday, May 27, 2008
Journal Entry 5/9 Continued
The person in the photo is the man's son. Since the man looking at the photo has no brothers and sisters we know that he is talking about himself when he says "my father's son". The riddle can now be read as "that man's father is me". Therefore the man in the photo is his son.
Journal Entry 5/16
To test Gretchen's idea, we need to use the magnet that we have. Although we are unsure at this point if the fur and silk have made magnets of the rods, we do know that these rods have opposite charges. We know they have opposite charges because they attract on another. If we put the two rods near the magnetic poles, and one rod attracts the magnet and the other rod repels the magnet, we will know that the rods themselves have become magnetic. When the experiment is performed the magnet is attracted to both rods which means they do not have opposite magnetic charges and therefore are not magnets. Gretchen is wrong. The rods aren't magnetic.
Tuesday, May 20, 2008
Journal Entry 5/9 Continued
I don't understand why my answer is wrong. Why isn't the person in the picture the son? If the person looking at the photo has the same father as the person in the photo and said person (the viewer) has no brothers and sisters, it has to be that person. The viewer is the son. I'm really struggling here, because I can't see where I made a mistake.
Sunday, May 11, 2008
Journal Entry 5/9 Continued
Having reread my explanation, I can see how that sentence threw you off. It is supposed to read, "If Dan and the man in the photo have the same father, "that man's father is my father", then the man in the photo is Dan himself!" I accidentally typed photo twice when I meant father the second time. I think this clarifies my answer, but if it doesn't let me know and I will try again.
Friday, May 9, 2008
Journal Entry 5/9
(Q) A man is looking at a photograph of someone. His friend asks who it is. The man replies, "Brothers and sisters, I have none. But that man’s father is my father’s son." Who was in the photograph?
(A) Let's say that the man looking at the photograph is named Dan. Dan has a father, named Tom. Dan's grandfather and Tom's father is named John. The riddle says that Dan is the one looking at the photo, so "my" represents Dan. By starting at the end of the riddle, we can figure it out. "My father's son" actually means "Dan's father's son" which means Dan, because he is his father's son. The riddle also says "that man's father". "That man" represents the person in the photo. If Dan and the man in the photo have the same photo, "that man's father is my father", then the man in the photo is Dan himself!
(A) Let's say that the man looking at the photograph is named Dan. Dan has a father, named Tom. Dan's grandfather and Tom's father is named John. The riddle says that Dan is the one looking at the photo, so "my" represents Dan. By starting at the end of the riddle, we can figure it out. "My father's son" actually means "Dan's father's son" which means Dan, because he is his father's son. The riddle also says "that man's father". "That man" represents the person in the photo. If Dan and the man in the photo have the same photo, "that man's father is my father", then the man in the photo is Dan himself!
Thursday, May 1, 2008
Journal Entry 5/1
(Q) Why does a tank have treads?
(A) A flat piece of rubber has a large area that touches the ground. The tank itself has a constant force, regardless of the terrain that it covers. When an object has a force and a large area, its pressure is not very large. The addition of treads to the rubber breaks up the area though. Even with the same force, but with a smaller area in contact with the ground, the pressure of the truck is increased. If the tank has a larger pressure, it is better equipped to go through a rugged landscape.
(Q) How do cleats work?
(A) Cleats are similar to treads on a tank. If you are wearing a basic sneaker, a large area of rubber is touching the ground. Your weight does not fluctuate while wearing the sneakers, so your force is constant. Therefore, with a force and a large area, the pressure will be small. Cleats help to increase an athletes pressure because they reduce the surface area of the shoe. The spikes on the bottom of the cleat have less area than a flat piece of rubber. When the force remains the same, but the area is reduced, the pressure increases. This is good because it helps athletes grip the ground while playing their sport, and it reduces the time they spend on the ground as a result of slipping and falling.
(Q) Why does a pin have a dull end and a sharp end?
(A) The purpose of a pin is to be used by a person to sew. It needs to have two pressures. Low pressure is necessary to enable the use/holding of the pin and high pressure is necessary to puncture the fabric. In terms of a pin, the dull end has a large area. The user's force on the pin does not fluctuate. With a force and a large area, there is a small pressure. The sharp end of the pin has a smaller area than the dull end. Because the force of the user on the pin has not changed, the pressure is increased with a smaller area. This is great because pins can be used to hang things up and they do not make people bleed, unless they push from the wrong end of course!
(A) A flat piece of rubber has a large area that touches the ground. The tank itself has a constant force, regardless of the terrain that it covers. When an object has a force and a large area, its pressure is not very large. The addition of treads to the rubber breaks up the area though. Even with the same force, but with a smaller area in contact with the ground, the pressure of the truck is increased. If the tank has a larger pressure, it is better equipped to go through a rugged landscape.
(Q) How do cleats work?
(A) Cleats are similar to treads on a tank. If you are wearing a basic sneaker, a large area of rubber is touching the ground. Your weight does not fluctuate while wearing the sneakers, so your force is constant. Therefore, with a force and a large area, the pressure will be small. Cleats help to increase an athletes pressure because they reduce the surface area of the shoe. The spikes on the bottom of the cleat have less area than a flat piece of rubber. When the force remains the same, but the area is reduced, the pressure increases. This is good because it helps athletes grip the ground while playing their sport, and it reduces the time they spend on the ground as a result of slipping and falling.
(Q) Why does a pin have a dull end and a sharp end?
(A) The purpose of a pin is to be used by a person to sew. It needs to have two pressures. Low pressure is necessary to enable the use/holding of the pin and high pressure is necessary to puncture the fabric. In terms of a pin, the dull end has a large area. The user's force on the pin does not fluctuate. With a force and a large area, there is a small pressure. The sharp end of the pin has a smaller area than the dull end. Because the force of the user on the pin has not changed, the pressure is increased with a smaller area. This is great because pins can be used to hang things up and they do not make people bleed, unless they push from the wrong end of course!
Journal Entry 4/25
Sorry this blog is so late...when I checked the website, no assignment was posted. Here's my work though:
(1) If you were to pour some orange juice into a glass, the glass is acting as a force of the juice. The glass does not shatter or fall in on itself, so clearly the force of the glass on the juice is counteracted by some other force. This means that the orange juice must have a force on the glass. For orange juice to have a force on something else, it must be made up of tiny particles that are in constant motion. This makes sense because I know that if I were to leave that glass outside, when I came back the juice would have evaporated from the glass. If the particles inside were not moving, how would that orange juice have evaporated? It wouldn't have. I am confident in my belief that the collisions of the particles within the juice, which are moving, act as a force against the glass and prevent the glass from falling in on itself.
(2) I know that gases are made of very small particles, in constant motion, with a lot of empty space between them. If I were to position 5 people at different spots on the floor, then spray, consecutively, two fragrances into the air, the person closest to the initial spray would smell the fragrances first and the person farthest away would smell it last. Every single person, regardless of their position, would smell the fragrances. This is because the empty spaces in the air take in the particles of fragrance. The fact that people in different locations all eventually smell the fragrance proves that gases are in constant motion. The fact that fragrances (plural) can be sprayed into the air proves that there is empty space in said air. If there were no spaces, then the fragrance wouldn't go into the air at all and no one would smell it.
(3) I know that liquids are also made of small moving particles because of evaporation. When a liquid is spread across a piece of paper, that spot gradually and slowly shrinks. The liquid particles do not go into the desk, they jump off the paper into the empty spaces in air. I also know that the empty space within a liquid is present, but less than that of air. If I was to combine two liquids, let's say 50 ml of blue liquid and 50 ml of green liquid, these two would form one liquid that was slightly less than 100 ml, like 96 ml. This proves that some particles of one liquid go into the empty spaces of the particles of the other liquid. The fact that the two colors mesh into one also proves that the particles are moving (hitting off of one another) and falling into empty spaces. There are less empty spaces than in gas though because there is only so much additions to the water that you can have, before there's too many.
(4) When you add heat to a system, the particles begin to move faster and they hit off of each other more frequently. For example, when you put a pot of water on the stove and then turn it on, you are adding heat to the system. Initially, the water is still. With time though, the water begins to boil. The molecules of water are hitting off of each other so much (with the addition of heat) that they begin to break through the surface. In contrast, when a substance is cooled, the particles begin to slow down. This is turn lowers the frequency of their collisions. If you take a glass of water and put it into the freezer, it will eventually turn to ice. This is because the cold is slowing down the particles to a point where when they collide with one another they begin to stick together, rather than bounding off. These connections reduce the area of the water and turn it into a solid, rather than a liquid.
(1) If you were to pour some orange juice into a glass, the glass is acting as a force of the juice. The glass does not shatter or fall in on itself, so clearly the force of the glass on the juice is counteracted by some other force. This means that the orange juice must have a force on the glass. For orange juice to have a force on something else, it must be made up of tiny particles that are in constant motion. This makes sense because I know that if I were to leave that glass outside, when I came back the juice would have evaporated from the glass. If the particles inside were not moving, how would that orange juice have evaporated? It wouldn't have. I am confident in my belief that the collisions of the particles within the juice, which are moving, act as a force against the glass and prevent the glass from falling in on itself.
(2) I know that gases are made of very small particles, in constant motion, with a lot of empty space between them. If I were to position 5 people at different spots on the floor, then spray, consecutively, two fragrances into the air, the person closest to the initial spray would smell the fragrances first and the person farthest away would smell it last. Every single person, regardless of their position, would smell the fragrances. This is because the empty spaces in the air take in the particles of fragrance. The fact that people in different locations all eventually smell the fragrance proves that gases are in constant motion. The fact that fragrances (plural) can be sprayed into the air proves that there is empty space in said air. If there were no spaces, then the fragrance wouldn't go into the air at all and no one would smell it.
(3) I know that liquids are also made of small moving particles because of evaporation. When a liquid is spread across a piece of paper, that spot gradually and slowly shrinks. The liquid particles do not go into the desk, they jump off the paper into the empty spaces in air. I also know that the empty space within a liquid is present, but less than that of air. If I was to combine two liquids, let's say 50 ml of blue liquid and 50 ml of green liquid, these two would form one liquid that was slightly less than 100 ml, like 96 ml. This proves that some particles of one liquid go into the empty spaces of the particles of the other liquid. The fact that the two colors mesh into one also proves that the particles are moving (hitting off of one another) and falling into empty spaces. There are less empty spaces than in gas though because there is only so much additions to the water that you can have, before there's too many.
(4) When you add heat to a system, the particles begin to move faster and they hit off of each other more frequently. For example, when you put a pot of water on the stove and then turn it on, you are adding heat to the system. Initially, the water is still. With time though, the water begins to boil. The molecules of water are hitting off of each other so much (with the addition of heat) that they begin to break through the surface. In contrast, when a substance is cooled, the particles begin to slow down. This is turn lowers the frequency of their collisions. If you take a glass of water and put it into the freezer, it will eventually turn to ice. This is because the cold is slowing down the particles to a point where when they collide with one another they begin to stick together, rather than bounding off. These connections reduce the area of the water and turn it into a solid, rather than a liquid.
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