Showing posts with label thiru. Show all posts
Showing posts with label thiru. Show all posts
Tuesday, July 20, 2010
light up matches with magnifing glass
Light emitted by the sun is made up of tiny packets of electromagnetic energy.the rays are refracted and due to the rays of light and its ability change angle as they pass through the lens and meet at a specific point.also with the preasence of oxygen,a fire is lit up.
Tuesday, April 27, 2010
physics
1)How many images would you get for an object that is placed between two mirrors placed at an angle less than 90(degrees)?
1)2.
2) What happens to the images if the angle is bigger than 90(degrees)?
2)If the angle is bigger than 90 degrees,the images will display different views of the object.
2)If the angle is bigger than 90 degrees,the images will display different views of the object.
3) How do mirrors produce funny images?
3there are three types of mirror they are the plane mirror,the convex mirror and the concave mirrors.the mirrors which create funny images are structured in a way that they are bent in different angles and when light reflects on them,the light will be reflected in another direction.Therefore causing people to see themselves in different shapes and sizes.
Thursday, April 15, 2010
37 part3
1. Male seahorses get pregnant! Is this true? How?
Male seahorses do not get pregnant! They do not produce the eggs themselves. They receive from the female a brood pouch (egg sac). The male then carries the egg pouch in a pocket somewhat like a kangeroo's. The male will take weeks before fertilizing the eggs so as to ensure that the offspring hatch at a time when their chances for survival are good.
2. Sound travels 15 times faster through steel than through the air.Why?
metals are solids whereas air is gas.the metals have free electrons and their atoms are packed closely together and the vibrations of sound can travel faster throngh it.In air, the molecules are far from each other and will take a longer time to travel gas.
3. Infants blink only once or twice a minute while adults average around 10. Why do we blink so many times? What is the purpose of blinking?!
it is because our eyes will become dry.
Male seahorses do not get pregnant! They do not produce the eggs themselves. They receive from the female a brood pouch (egg sac). The male then carries the egg pouch in a pocket somewhat like a kangeroo's. The male will take weeks before fertilizing the eggs so as to ensure that the offspring hatch at a time when their chances for survival are good.
2. Sound travels 15 times faster through steel than through the air.Why?
metals are solids whereas air is gas.the metals have free electrons and their atoms are packed closely together and the vibrations of sound can travel faster throngh it.In air, the molecules are far from each other and will take a longer time to travel gas.
3. Infants blink only once or twice a minute while adults average around 10. Why do we blink so many times? What is the purpose of blinking?!
it is because our eyes will become dry.
4. French kissing involves all 34 muscles in the face. Really? Which 34 muscles on the face? Show me a diagram and explain how it works!
Yeah, It involves. 34 facial muscles & 112 postura.
37 part 2
1. Explain what is wrong with the design.
First of all,the dam is too close to the village and if the dam gives way,the whole village will be destroyed.The wall should not be straight.
2. Why the crack appeared at the location and not anywhere above?
the water currents are stronger at thev bottom.
3. Offer a better design with explanations
First of all,the dam is too close to the village and if the dam gives way,the whole village will be destroyed.The wall should not be straight.
2. Why the crack appeared at the location and not anywhere above?
the water currents are stronger at thev bottom.
3. Offer a better design with explanations
make the wall like a v shape...it will be able to contain more water and the bottom will be able to take the preasure.
Tuesday, April 13, 2010
Invention of the compass
The compass is a device used to determine direction on the surface of the earth. The most familiar type of compass is the magnetic compass, which relies on the fact that a magnetic object tends to align itself with Earth's magnetic field.It dates back to the first century B.C,the Chinese learned that pieces of lodestone (an iron metal) always pointed North when placed on a flat surface.The discovery of Earth's magnetic field, electric energy carried between the North and South poles has been traced to the use of the lodestone.
Other types of compasses determine direction by using the position of the Sun or a star, or by relying on the fact that a rapidly spinning object (a gyroscope) tends to resist being turned away from the direction in which its axis is pointing.
http://www.4to40.com/images/science/compass/epistola_de_magnet.jpg
http://www.4to40.com/images/science/compass/astrolab.jpg
The north magnetic pole is situated at the northernmost point of the Arctic coast of north America and all compass needles in the northern Hemisphere point toward this point. But ancient people didn't know the difference. The sailors of later days noticed the difference and were greatly puzzled. After that this kind of puzzle came to the point and the difference between north geographical pole and north magnetic pole was considered and treated differently.
Other types of compasses determine direction by using the position of the Sun or a star, or by relying on the fact that a rapidly spinning object (a gyroscope) tends to resist being turned away from the direction in which its axis is pointing.
http://www.4to40.com/images/science/compass/epistola_de_magnet.jpg
http://www.4to40.com/images/science/compass/astrolab.jpg
The north magnetic pole is situated at the northernmost point of the Arctic coast of north America and all compass needles in the northern Hemisphere point toward this point. But ancient people didn't know the difference. The sailors of later days noticed the difference and were greatly puzzled. After that this kind of puzzle came to the point and the difference between north geographical pole and north magnetic pole was considered and treated differently.
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