Hoe does a matchstick be light up with a magnifying glass.

http://ncealevel2sci.wikispaces.com/file/view/lensmagnifying.png
According to my research:



Sunlight can be used as a focus at a point with the assist of a magnifying glass and when we place the match stick at that focus point,the match stick can get enough heat and it will light up.

Because friction produces heat so when the match stick strike against the the match box,the match stick lights up.

However without the match box,using the magnifying glass,the magnifying glass concentrates the heat and the light of the sun on the tip of the match stick,the tip of the match stick became hot and it light up.

http://www.arvindguptatoys.com/arvindgupta/ScienceAction3.pdf

Physics graded assignment(mirrors)

1)How many images would you get for an object that is placed between two mirrors placed at an angle less than 90(degrees)?

There will be at least 3 images reflected as the smaller the angle the more the images.

2) What happens to the images of this angle if it is bigger than 90(degrees)?

When the angle is bigger,there will be less image .

3) How do mirrors produce funny images?

It produce funny images because of concave and convex mirrors.
As concave mirror are spherical mirror,so when a person stand in front of it,the person will looked fat.
However convex mirror is totally different,convex mirror are curved mirror , it will let the person look thinner and skinnier when the person stood in front.

Microwaved food is definitely safe if not our government will surely stop microwave from producing.

However microwave are not safe too.

It will be really harmful if consumed in long-term condition.

It also affect the nutrition value of the food and when you heat up the food,the paper,paperboard,polymers products will enters into the food and it is really unhealthy and unsafe to eat the food.

However microwave cooking is what we people alway ignored.

I think some of us will also not know that microwave cooking is actually harmful.

There is also one incident that caused a woman died when a nurse used microwave to heat up the blood for blood transfusion and the woman died of the sugery.

It is also not recommended to microwave a baby bottle.

Although it might appeared cool on the bottle,the milk is really hot and it will hurt the baby's mouth and throat and it will also causes vitamin lose of the infant milk.

There's also research that when you ate microwave food,there will be a decrease in your haemoglobin levels .

And not only this, microwaving also causes food molecules to form 'new life' ,radiolytic compounds.

Although normal cooking also will form this new compund,microwaving created a greater number.

It also show a decrease on Lymphocytes, a white blood cell, when after intake of microwaved food.

So i suggest we can heat food in other alternatives than a microwave.

Links:

http://ezinearticles.com/?Is-Microwave-Cooking-Safe-and-Healthy?&id=2769303

http://www.relfe.com/microwave.html

http://www.google.com.sg/imglanding?q=microwave&imgurl=http://www.fsis.usda.gov/OA/pubs/cfg/Color/jpg/10-microwave.jpg&imgrefurl=http://www.fsis.usda.gov/OA/pubs/cfg/downloadart.htm&usg=__hlxCH268gCfwqb1Mn8EHz1x-Z8Y=&h=372&w=624&sz=92&hl=en&itbs=1&tbnid=m4z-qND4fSDJ_M:&tbnh=81&tbnw=136&prev=/images%3Fq%3Dmicrowave%26hl%3Den%26gbv%3D2%26tbs%3Disch:1&gbv=2&tbs=isch:1&start=1#tbnid=ocYZTEniEt7itM&start=4

E-learning part 3 (17)

No the temperature cycle is the same , it only depends the body area,the time of the day,the level of physical activity. Age does affect the temperature cycle ,as a baby cannot really control its temperature,the baby temperature will keep go up and down and very not steady.The elderly also have lower temperature as they did not work up usually so their temperature is lower.The weather does affect,when the weather is hot our body temperature will rise a little and when the weather is cold our temperature will also drop a little. When raining our temperature will also decrease abit.Yes exercise at different time of the day does affect body temperature ,example like when you do exercise in the morning,the morning temperature is low so when you work upyour temperature will increase but in the afternoon as the weather is warmer so our temperature will also increase.Yes it does,as our mood affect our behavior and if our mood is bad we will eat less and we will feel weak and we will not concentrate more.

http://www.buzzle.com/articles/normal-body-temperature-range.html

E-learning part 2

If the alien offered their scientific kowledge,I think it will be good as if they shared their kniwledge to us maybe the Earth can be saved by their scientific knowledge.
As they are 400 thousand years ahead of us,they can surely fnd ways to stop gobal warming,and more new inventions,maybe like robots too.
And if they shared their scientific knowledge with us and we can maybe dun need to burn coal to get electricity maybe there's one medicine that can cure many diseases that we cannot be able to find a cure now,like AIDS.
So I think it will be good when the kind-hearted aliens' spaceship landed on Earth and offered their scientific knowledge to us.

http://images.google.com.sg/imglanding?q=cartoon%20air%20condition&imgurl=http://www.istockphoto.com/file_thumbview_approve/4487580/2/istockphoto_4487580-cool-air.jpg&imgrefurl=http://www.istockphoto.com/file_closeup/people/4487580-cool-air.php%3Fid%3D4487580&usg=__rFod0ukLMnJMPYFpGl4UDN5riGw=&h=355&w=380&sz=51&hl=en&sig2=-9SZJnHbKsVQDA1uiySaIg&itbs=1&tbnid=CuCz8x8WKRKOBM:&tbnh=115&tbnw=123&prev=/images%3Fq%3Dcartoon%2Bair%2Bcondition%26hl%3Den%26gbv%3D2%26tbs%3Disch:1&ei=h2rES6qGJI7m7AOZiv31DQ&gbv=2&tbs=isch:1&start=6#tbnid=CuCz8x8WKRKOBM&start=10

Air condition is the invention that I like the best as the weather is very hot recently.
It is very cooling. A air condition will alway place on the higher position of the room as the cold air(denser) will sink,the hot air will rise and this continues until the temperature of the room is the same.

This fascinated me as when I sleep I can have cooling air condition to enjoy.
And I wonder why it can produce cold air until i have a research on it.
It also help us to cool down when the weather is very humid and hot.
We also like to hang out in the air-condition room as it is very enjoying.