How does a magnifying glass light up a match stick

A magnifying glass is a convex lens. It can light up a match stick using the sun's light ray. The glass will concentrate the sun’s rays into a much smaller focal point causing that area to heat up very quickly. When the match stick gets heated up, it will ignite. The magnifying glass is also able to burn other materials.

Networking project for chemistry (Register no. 25)

1 ) Microwaved food is believed to contain microwaves. How safe is microwaved food ?

Answer:

1) Microwaved food is safe to eat but consuming it too much will cause health problems to our body. Microwaved food contains high amounts of fat and salt, which can lead to obesity. There are also radioactive waves used to heat up the food. As the waves pass through water, it reacts with it to get heat, this heat is used to cook the food. So it is best not to eat microwaved food so often.

PHYSICS Graded Assignment reg no. 25

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

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

3) How do mirrors produce funny images?

Answer:

1) If an object is placed between two mirrors placed at an angle less than 90 degrees, there will be two or more images seen on the mirror. As the angle decreases, the more images i will get.

2) If the angle of the two mirrors is more than 90 degrees, lesser images can be seen. This is because the mirrors are not facing each other directly, and it will reflect less of the object.

3) Only two types of mirrors can produce funny images. They are the concave and convex mirrors. When light is reflected on them, the image is reflected into another direction.

1)Our skin turns darker under the sun light because our body prevents our skin from breaking down. Our hair gets lighter because sunlight breaks down molecular surfaces on our hair 2)The oil in vegetables are actually stored in plants for energy. Vegetables do have fat in them, but healthier than oil from fats. 3)The cockroach can survive almost on anything, it can also survive after a nuclear bomb!The cockroach can live up to a week without dying and without its head, it cannot eat or drink and dies. Cockroaches breath through spiracles which are in each body segment and the blood does not carry oxygen to the tissues. The spiracles deliver air to each cell of the body through a set of tubes called tracheae. The brain does not control the breathing through the spiracles. The cockroach does not have blood pressure in the head like a mammal does and so cutting off the head does not lead to uncontrolled bleeding. Gordon

Invention of computers

During the 1930s and 1940s, ideas of many scientists and engineers led to its invention. There was not only one inventor. Before 1900s, there were scientists raising the idea of building a machine that could cope with general problems.

In 1938, a German mathematician, Konrad Zuse, invented Z1. Many historians believe that it was the first computer. Z1 then led to the invention of Z2 and Z3. the last was only the world's first programmable calculator. The work done by Zuse was then interrupted by the World War two.

In America, Howard Aitkins and his team at Harvard University, completed Mark 1 in 1943. It could perform basic mathematical functions. This invention occurred during a very important era for computer development. During this war, Britain wanted to develop a computing machine that would break the secret codes used by the Nazis. Some of the country’s most brilliant mathematicians were based at Bletchley Park, including the outstanding Alan Turing. Even before the war, Turing had attempted to develop a machine capable of performing all the operations of mathematics. Such a machine would have been able to crack even the most difficult of secret codes.

By December 1943, a new device was invented at Bletchley Park called "Colossus". It was not a true computer but it did show that machines could do a lot more than handle numerical problems. By today, computers are getting more advanced and is much more complicated. Without the help of scientists and their inventions, we would not be able to communicate so easily but a different way.