QUESTIONS

How many years will be required for a radioactive material like Uranium to disappear after a reactor explodes like in the terrible nuclear accident occurred in Chernobyl and what are their long-term effects?

Like 1520 million years will be required for Uranium to dissapear on Earth, their effects could be damage in skin, when a baby borns it could bring physic damages, it can develope cancer.

Can a fly or temperature of a corpse help in finding the time of death ?

Yes they can help, because you can use techniques like Newton´s Law of Cooling, and you can put there the temperature to take the time of death, of flies could contribute with information, because depending in the number of flies you find in the room, you can use it of reference to take the time that the murder has happened.

Why a painting of the Dutch painter Vermeer de Delft, titled Christ at Emaus, was withdrawn from the Boymans of Rotterdam Museum in 1945 after a painter named Hans van Meegeren declared publicly that the painting was a forgery? How was it proved that it was really a forgery?

Bacause it was fake, like another more. They proved it with techniques, like the effect of alcohol in the pigments, use of Hypodermic needles to determine the quimic content of the painting, x-rays or infrared to photocopy the linen.

Reflection time

What do you think is the most important thing you learned through this WebQuest?

The use of technology to complete some projects, like morder we wrote, and thanks to this webquest, we learned how to follow instructions from the internet.

Would you recommend the use of a WebQuest to learn Mathematics or some other Science subject?

Yes, I do :)

VACATIONS

The last week, I went to Bahia de Lobos and I camped with my family, I built the two tents, and my father built the kitchen and the bathroom, I spend a whole week with my big family from the Felix, we were about 300 family people and there were like 1000 people more that camped there. I met new cousins and I ride all day long motocycles, and I went to the Island of Lobos in a boat were I saw "lobos marinos", I enjoyed the view of the beach, I took out "almejas" and my family ate them, and I tanned myself.

I liked all my vacation without resting, it was cool! :)

This week..

About the project, we're working on it, but the truth is that we have a lot of projects to do too in other subjects so we're uncontroled, and the part of the project that I have i like it, because is the one that you invent your history and you can make whatever you want...

My my weekend was super cool! I partipated in the Festival de Baile of tec in Leon, Gto., and we didn't won first place, but we won a lot of friends from everywhere and experiences that I would never forget.. !! :)

about the CENEVAL

well.. i really don't know what grade i'm going to get in the CENEVAL, because there were questions that in my life.. i never heard of.. but in the questions that i felt more comfortable and that were easy .. they were the math section, because if you can solve the problem you know the answer, there's only a correct one, but i hope to get a good grade :)

Table Time

Linda click the chart, so you can see it complete :)

Newton's Law of Cooling

1. What is the Newton’s Law of Cooling?
Is a method that gives you the time aproximmately of the murder, (the difference between its temperature and the temperature of the surrounding environment).

2. What variables in your problem correspond with the variables in the Newton’s Law of Cooling?
the temperatures of the body, the environment. and the time when they took the temperature of the death body.

3. According to this Law, at what time approximately the death happened?
At 8:48 and 8:55 PM.

4. How does the room temperature affect the time of death?
Because the temperature of the room affects the body, for example if the temperature is higher the body would be with a high temperature or vice-verse, and this affect the time of death, because if you get a mistake with all the information of the temperature you're time of death could be wrong too.

5. How does an illness (e.g. fever) affect the time of death?
It increases the body temperature, so it also make changes in the time of death.

6. How exact is the approximation of the Newton’s Law of Cooling for predicting the time of death?
It can be a good approximation if the information you took is exact, but if you get an unknown or an estimated information it can't be an exact approximation.

The Process

4. What methods are commonly used to find the time of death?

*The rate method: which consists in measuring the changes that the body had in that time, if it was initiated of stopped by the investigation.

*The concurrence method: which consists in comparing the events that were in the time of the murder and in the time of the investigation.

5. What factors are considered in Algor Mortis?

Body temperature, radiation, convection and evaporation.

6. How does the environment affect the time of death?

The environment affects the body, so it means that the environment make changes in the body, and that changes perjudicated the time of death, and of course if the temperature of the body is the same of the environment, we can't give a time of death.

7. What can you tell about the different methods of temperature reading of the body? Do they make a difference in the results?

I think that they are necessary, but i don't think that they gives you an exact answer to tell who was the guilty person, but it serves like a reference and they make a big diffentiation in the results, because now you are ubicated in what time did the murdered take place.